text: /*!
   * Knockout JavaScript library v3.4.2
   * (c) The Knockout.js team - http://knockoutjs.com/
   * License: MIT (http://www.opensource.org/licenses/mit-license.php)
   */
  
  (function(){
  var DEBUG=true;
  (function(undefined){
      // (0, eval)('this') is a robust way of getting a reference to the global object
      // For details, see http://stackoverflow.com/questions/14119988/return-this-0-evalthis/14120023#14120023
      var window = this || (0, eval)('this'),
          document = window['document'],
          navigator = window['navigator'],
          jQueryInstance = window["jQuery"],
          JSON = window["JSON"];
  (function(factory) {
      // Support three module loading scenarios
      if (typeof define === 'function' && define['amd']) {
          // [1] AMD anonymous module
          define(['exports', 'require'], factory);
      } else if (typeof exports === 'object' && typeof module === 'object') {
          // [2] CommonJS/Node.js
          factory(module['exports'] || exports);  // module.exports is for Node.js
      } else {
          // [3] No module loader (plain <script> tag) - put directly in global namespace
          factory(window['ko'] = {});
      }
  }(function(koExports, amdRequire){
  // Internally, all KO objects are attached to koExports (even the non-exported ones whose names will be minified by the closure compiler).
  // In the future, the following "ko" variable may be made distinct from "koExports" so that private objects are not externally reachable.
  var ko = typeof koExports !== 'undefined' ? koExports : {};
  // Google Closure Compiler helpers (used only to make the minified file smaller)
  ko.exportSymbol = function(koPath, object) {
      var tokens = koPath.split(".");
  
      // In the future, "ko" may become distinct from "koExports" (so that non-exported objects are not reachable)
      // At that point, "target" would be set to: (typeof koExports !== "undefined" ? koExports : ko)
      var target = ko;
  
      for (var i = 0; i < tokens.length - 1; i++)
          target = target[tokens[i]];
      target[tokens[tokens.length - 1]] = object;
  };
  ko.exportProperty = function(owner, publicName, object) {
      owner[publicName] = object;
  };
  ko.version = "3.4.2";
  
  ko.exportSymbol('version', ko.version);
  // For any options that may affect various areas of Knockout and aren't directly associated with data binding.
  ko.options = {
      'deferUpdates': false,
      'useOnlyNativeEvents': false
  };
  
  //ko.exportSymbol('options', ko.options);   // 'options' isn't minified
  ko.utils = (function () {
      function objectForEach(obj, action) {
          for (var prop in obj) {
              if (obj.hasOwnProperty(prop)) {
                  action(prop, obj[prop]);
              }
          }
      }
  
      function extend(target, source) {
          if (source) {
              for(var prop in source) {
                  if(source.hasOwnProperty(prop)) {
                      target[prop] = source[prop];
                  }
              }
          }
          return target;
      }
  
      function setPrototypeOf(obj, proto) {
          obj.__proto__ = proto;
          return obj;
      }
  
      var canSetPrototype = ({ __proto__: [] } instanceof Array);
      var canUseSymbols = !DEBUG && typeof Symbol === 'function';
  
      // Represent the known event types in a compact way, then at runtime transform it into a hash with event name as key (for fast lookup)
      var knownEvents = {}, knownEventTypesByEventName = {};
      var keyEventTypeName = (navigator && /Firefox\/2/i.test(navigator.userAgent)) ? 'KeyboardEvent' : 'UIEvents';
      knownEvents[keyEventTypeName] = ['keyup', 'keydown', 'keypress'];
      knownEvents['MouseEvents'] = ['click', 'dblclick', 'mousedown', 'mouseup', 'mousemove', 'mouseover', 'mouseout', 'mouseenter', 'mouseleave'];
      objectForEach(knownEvents, function(eventType, knownEventsForType) {
          if (knownEventsForType.length) {
              for (var i = 0, j = knownEventsForType.length; i < j; i++)
                  knownEventTypesByEventName[knownEventsForType[i]] = eventType;
          }
      });
      var eventsThatMustBeRegisteredUsingAttachEvent = { 'propertychange': true }; // Workaround for an IE9 issue - https://github.com/SteveSanderson/knockout/issues/406
  
      // Detect IE versions for bug workarounds (uses IE conditionals, not UA string, for robustness)
      // Note that, since IE 10 does not support conditional comments, the following logic only detects IE < 10.
      // Currently this is by design, since IE 10+ behaves correctly when treated as a standard browser.
      // If there is a future need to detect specific versions of IE10+, we will amend this.
      var ieVersion = document && (function() {
          var version = 3, div = document.createElement('div'), iElems = div.getElementsByTagName('i');
  
          // Keep constructing conditional HTML blocks until we hit one that resolves to an empty fragment
          while (
              div.innerHTML = '<!--[if gt IE ' + (++version) + ']><i></i><![endif]-->',
              iElems[0]
          ) {}
          return version > 4 ? version : undefined;
      }());
      var isIe6 = ieVersion === 6,
          isIe7 = ieVersion === 7;
  
      function isClickOnCheckableElement(element, eventType) {
          if ((ko.utils.tagNameLower(element) !== "input") || !element.type) return false;
          if (eventType.toLowerCase() != "click") return false;
          var inputType = element.type;
          return (inputType == "checkbox") || (inputType == "radio");
      }
  
      // For details on the pattern for changing node classes
      // see: https://github.com/knockout/knockout/issues/1597
      var cssClassNameRegex = /\S+/g;
  
      function toggleDomNodeCssClass(node, classNames, shouldHaveClass) {
          var addOrRemoveFn;
          if (classNames) {
              if (typeof node.classList === 'object') {
                  addOrRemoveFn = node.classList[shouldHaveClass ? 'add' : 'remove'];
                  ko.utils.arrayForEach(classNames.match(cssClassNameRegex), function(className) {
                      addOrRemoveFn.call(node.classList, className);
                  });
              } else if (typeof node.className['baseVal'] === 'string') {
                  // SVG tag .classNames is an SVGAnimatedString instance
                  toggleObjectClassPropertyString(node.className, 'baseVal', classNames, shouldHaveClass);
              } else {
                  // node.className ought to be a string.
                  toggleObjectClassPropertyString(node, 'className', classNames, shouldHaveClass);
              }
          }
      }
  
      function toggleObjectClassPropertyString(obj, prop, classNames, shouldHaveClass) {
          // obj/prop is either a node/'className' or a SVGAnimatedString/'baseVal'.
          var currentClassNames = obj[prop].match(cssClassNameRegex) || [];
          ko.utils.arrayForEach(classNames.match(cssClassNameRegex), function(className) {
              ko.utils.addOrRemoveItem(currentClassNames, className, shouldHaveClass);
          });
          obj[prop] = currentClassNames.join(" ");
      }
  
      return {
          fieldsIncludedWithJsonPost: ['authenticity_token', /^__RequestVerificationToken(_.*)?$/],
  
          arrayForEach: function (array, action) {
              for (var i = 0, j = array.length; i < j; i++)
                  action(array[i], i);
          },
  
          arrayIndexOf: function (array, item) {
              if (typeof Array.prototype.indexOf == "function")
                  return Array.prototype.indexOf.call(array, item);
              for (var i = 0, j = array.length; i < j; i++)
                  if (array[i] === item)
                      return i;
              return -1;
          },
  
          arrayFirst: function (array, predicate, predicateOwner) {
              for (var i = 0, j = array.length; i < j; i++)
                  if (predicate.call(predicateOwner, array[i], i))
                      return array[i];
              return null;
          },
  
          arrayRemoveItem: function (array, itemToRemove) {
              var index = ko.utils.arrayIndexOf(array, itemToRemove);
              if (index > 0) {
                  array.splice(index, 1);
              }
              else if (index === 0) {
                  array.shift();
              }
          },
  
          arrayGetDistinctValues: function (array) {
              array = array || [];
              var result = [];
              for (var i = 0, j = array.length; i < j; i++) {
                  if (ko.utils.arrayIndexOf(result, array[i]) < 0)
                      result.push(array[i]);
              }
              return result;
          },
  
          arrayMap: function (array, mapping) {
              array = array || [];
              var result = [];
              for (var i = 0, j = array.length; i < j; i++)
                  result.push(mapping(array[i], i));
              return result;
          },
  
          arrayFilter: function (array, predicate) {
              array = array || [];
              var result = [];
              for (var i = 0, j = array.length; i < j; i++)
                  if (predicate(array[i], i))
                      result.push(array[i]);
              return result;
          },
  
          arrayPushAll: function (array, valuesToPush) {
              if (valuesToPush instanceof Array)
                  array.push.apply(array, valuesToPush);
              else
                  for (var i = 0, j = valuesToPush.length; i < j; i++)
                      array.push(valuesToPush[i]);
              return array;
          },
  
          addOrRemoveItem: function(array, value, included) {
              var existingEntryIndex = ko.utils.arrayIndexOf(ko.utils.peekObservable(array), value);
              if (existingEntryIndex < 0) {
                  if (included)
                      array.push(value);
              } else {
                  if (!included)
                      array.splice(existingEntryIndex, 1);
              }
          },
  
          canSetPrototype: canSetPrototype,
  
          extend: extend,
  
          setPrototypeOf: setPrototypeOf,
  
          setPrototypeOfOrExtend: canSetPrototype ? setPrototypeOf : extend,
  
          objectForEach: objectForEach,
  
          objectMap: function(source, mapping) {
              if (!source)
                  return source;
              var target = {};
              for (var prop in source) {
                  if (source.hasOwnProperty(prop)) {
                      target[prop] = mapping(source[prop], prop, source);
                  }
              }
              return target;
          },
  
          emptyDomNode: function (domNode) {
              while (domNode.firstChild) {
                  ko.removeNode(domNode.firstChild);
              }
          },
  
          moveCleanedNodesToContainerElement: function(nodes) {
              // Ensure it's a real array, as we're about to reparent the nodes and
              // we don't want the underlying collection to change while we're doing that.
              var nodesArray = ko.utils.makeArray(nodes);
              var templateDocument = (nodesArray[0] && nodesArray[0].ownerDocument) || document;
  
              var container = templateDocument.createElement('div');
              for (var i = 0, j = nodesArray.length; i < j; i++) {
                  container.appendChild(ko.cleanNode(nodesArray[i]));
              }
              return container;
          },
  
          cloneNodes: function (nodesArray, shouldCleanNodes) {
              for (var i = 0, j = nodesArray.length, newNodesArray = []; i < j; i++) {
                  var clonedNode = nodesArray[i].cloneNode(true);
                  newNodesArray.push(shouldCleanNodes ? ko.cleanNode(clonedNode) : clonedNode);
              }
              return newNodesArray;
          },
  
          setDomNodeChildren: function (domNode, childNodes) {
              ko.utils.emptyDomNode(domNode);
              if (childNodes) {
                  for (var i = 0, j = childNodes.length; i < j; i++)
                      domNode.appendChild(childNodes[i]);
              }
          },
  
          replaceDomNodes: function (nodeToReplaceOrNodeArray, newNodesArray) {
              var nodesToReplaceArray = nodeToReplaceOrNodeArray.nodeType ? [nodeToReplaceOrNodeArray] : nodeToReplaceOrNodeArray;
              if (nodesToReplaceArray.length > 0) {
                  var insertionPoint = nodesToReplaceArray[0];
                  var parent = insertionPoint.parentNode;
                  for (var i = 0, j = newNodesArray.length; i < j; i++)
                      parent.insertBefore(newNodesArray[i], insertionPoint);
                  for (var i = 0, j = nodesToReplaceArray.length; i < j; i++) {
                      ko.removeNode(nodesToReplaceArray[i]);
                  }
              }
          },
  
          fixUpContinuousNodeArray: function(continuousNodeArray, parentNode) {
              // Before acting on a set of nodes that were previously outputted by a template function, we have to reconcile
              // them against what is in the DOM right now. It may be that some of the nodes have already been removed, or that
              // new nodes might have been inserted in the middle, for example by a binding. Also, there may previously have been
              // leading comment nodes (created by rewritten string-based templates) that have since been removed during binding.
              // So, this function translates the old "map" output array into its best guess of the set of current DOM nodes.
              //
              // Rules:
              //   [A] Any leading nodes that have been removed should be ignored
              //       These most likely correspond to memoization nodes that were already removed during binding
              //       See https://github.com/knockout/knockout/pull/440
              //   [B] Any trailing nodes that have been remove should be ignored
              //       This prevents the code here from adding unrelated nodes to the array while processing rule [C]
              //       See https://github.com/knockout/knockout/pull/1903
              //   [C] We want to output a continuous series of nodes. So, ignore any nodes that have already been removed,
              //       and include any nodes that have been inserted among the previous collection
  
              if (continuousNodeArray.length) {
                  // The parent node can be a virtual element; so get the real parent node
                  parentNode = (parentNode.nodeType === 8 && parentNode.parentNode) || parentNode;
  
                  // Rule [A]
                  while (continuousNodeArray.length && continuousNodeArray[0].parentNode !== parentNode)
                      continuousNodeArray.splice(0, 1);
  
                  // Rule [B]
                  while (continuousNodeArray.length > 1 && continuousNodeArray[continuousNodeArray.length - 1].parentNode !== parentNode)
                      continuousNodeArray.length--;
  
                  // Rule [C]
                  if (continuousNodeArray.length > 1) {
                      var current = continuousNodeArray[0], last = continuousNodeArray[continuousNodeArray.length - 1];
                      // Replace with the actual new continuous node set
                      continuousNodeArray.length = 0;
                      while (current !== last) {
                          continuousNodeArray.push(current);
                          current = current.nextSibling;
                      }
                      continuousNodeArray.push(last);
                  }
              }
              return continuousNodeArray;
          },
  
          setOptionNodeSelectionState: function (optionNode, isSelected) {
              // IE6 sometimes throws "unknown error" if you try to write to .selected directly, whereas Firefox struggles with setAttribute. Pick one based on browser.
              if (ieVersion < 7)
                  optionNode.setAttribute("selected", isSelected);
              else
                  optionNode.selected = isSelected;
          },
  
          stringTrim: function (string) {
              return string === null || string === undefined ? '' :
                  string.trim ?
                      string.trim() :
                      string.toString().replace(/^[\s\xa0]+|[\s\xa0]+$/g, '');
          },
  
          stringStartsWith: function (string, startsWith) {
              string = string || "";
              if (startsWith.length > string.length)
                  return false;
              return string.substring(0, startsWith.length) === startsWith;
          },
  
          domNodeIsContainedBy: function (node, containedByNode) {
              if (node === containedByNode)
                  return true;
              if (node.nodeType === 11)
                  return false; // Fixes issue #1162 - can't use node.contains for document fragments on IE8
              if (containedByNode.contains)
                  return containedByNode.contains(node.nodeType === 3 ? node.parentNode : node);
              if (containedByNode.compareDocumentPosition)
                  return (containedByNode.compareDocumentPosition(node) & 16) == 16;
              while (node && node != containedByNode) {
                  node = node.parentNode;
              }
              return !!node;
          },
  
          domNodeIsAttachedToDocument: function (node) {
              return ko.utils.domNodeIsContainedBy(node, node.ownerDocument.documentElement);
          },
  
          anyDomNodeIsAttachedToDocument: function(nodes) {
              return !!ko.utils.arrayFirst(nodes, ko.utils.domNodeIsAttachedToDocument);
          },
  
          tagNameLower: function(element) {
              // For HTML elements, tagName will always be upper case; for XHTML elements, it'll be lower case.
              // Possible future optimization: If we know it's an element from an XHTML document (not HTML),
              // we don't need to do the .toLowerCase() as it will always be lower case anyway.
              return element && element.tagName && element.tagName.toLowerCase();
          },
  
          catchFunctionErrors: function (delegate) {
              return ko['onError'] ? function () {
                  try {
                      return delegate.apply(this, arguments);
                  } catch (e) {
                      ko['onError'] && ko['onError'](e);
                      throw e;
                  }
              } : delegate;
          },
  
          setTimeout: function (handler, timeout) {
              return setTimeout(ko.utils.catchFunctionErrors(handler), timeout);
          },
  
          deferError: function (error) {
              setTimeout(function () {
                  ko['onError'] && ko['onError'](error);
                  throw error;
              }, 0);
          },
  
          registerEventHandler: function (element, eventType, handler) {
              var wrappedHandler = ko.utils.catchFunctionErrors(handler);
  
              var mustUseAttachEvent = ieVersion && eventsThatMustBeRegisteredUsingAttachEvent[eventType];
              if (!ko.options['useOnlyNativeEvents'] && !mustUseAttachEvent && jQueryInstance) {
                  jQueryInstance(element)['bind'](eventType, wrappedHandler);
              } else if (!mustUseAttachEvent && typeof element.addEventListener == "function")
                  element.addEventListener(eventType, wrappedHandler, false);
              else if (typeof element.attachEvent != "undefined") {
                  var attachEventHandler = function (event) { wrappedHandler.call(element, event); },
                      attachEventName = "on" + eventType;
                  element.attachEvent(attachEventName, attachEventHandler);
  
                  // IE does not dispose attachEvent handlers automatically (unlike with addEventListener)
                  // so to avoid leaks, we have to remove them manually. See bug #856
                  ko.utils.domNodeDisposal.addDisposeCallback(element, function() {
                      element.detachEvent(attachEventName, attachEventHandler);
                  });
              } else
                  throw new Error("Browser doesn't support addEventListener or attachEvent");
          },
  
          triggerEvent: function (element, eventType) {
              if (!(element && element.nodeType))
                  throw new Error("element must be a DOM node when calling triggerEvent");
  
              // For click events on checkboxes and radio buttons, jQuery toggles the element checked state *after* the
              // event handler runs instead of *before*. (This was fixed in 1.9 for checkboxes but not for radio buttons.)
              // IE doesn't change the checked state when you trigger the click event using "fireEvent".
              // In both cases, we'll use the click method instead.
              var useClickWorkaround = isClickOnCheckableElement(element, eventType);
  
              if (!ko.options['useOnlyNativeEvents'] && jQueryInstance && !useClickWorkaround) {
                  jQueryInstance(element)['trigger'](eventType);
              } else if (typeof document.createEvent == "function") {
                  if (typeof element.dispatchEvent == "function") {
                      var eventCategory = knownEventTypesByEventName[eventType] || "HTMLEvents";
                      var event = document.createEvent(eventCategory);
                      event.initEvent(eventType, true, true, window, 0, 0, 0, 0, 0, false, false, false, false, 0, element);
                      element.dispatchEvent(event);
                  }
                  else
                      throw new Error("The supplied element doesn't support dispatchEvent");
              } else if (useClickWorkaround && element.click) {
                  element.click();
              } else if (typeof element.fireEvent != "undefined") {
                  element.fireEvent("on" + eventType);
              } else {
                  throw new Error("Browser doesn't support triggering events");
              }
          },
  
          unwrapObservable: function (value) {
              return ko.isObservable(value) ? value() : value;
          },
  
          peekObservable: function (value) {
              return ko.isObservable(value) ? value.peek() : value;
          },
  
          toggleDomNodeCssClass: toggleDomNodeCssClass,
  
          setTextContent: function(element, textContent) {
              var value = ko.utils.unwrapObservable(textContent);
              if ((value === null) || (value === undefined))
                  value = "";
  
              // We need there to be exactly one child: a text node.
              // If there are no children, more than one, or if it's not a text node,
              // we'll clear everything and create a single text node.
              var innerTextNode = ko.virtualElements.firstChild(element);
              if (!innerTextNode || innerTextNode.nodeType != 3 || ko.virtualElements.nextSibling(innerTextNode)) {
                  ko.virtualElements.setDomNodeChildren(element, [element.ownerDocument.createTextNode(value)]);
              } else {
                  innerTextNode.data = value;
              }
  
              ko.utils.forceRefresh(element);
          },
  
          setElementName: function(element, name) {
              element.name = name;
          },
  
          forceRefresh: function(node) {
              // Workaround for an IE9 rendering bug - https://github.com/SteveSanderson/knockout/issues/209
              if (ieVersion >= 9) {
                  // For text nodes and comment nodes (most likely virtual elements), we will have to refresh the container
                  var elem = node.nodeType == 1 ? node : node.parentNode;
                  if (elem.style)
                      elem.style.zoom = elem.style.zoom;
              }
          },
  
          ensureSelectElementIsRenderedCorrectly: function(selectElement) {
              // Workaround for IE9 rendering bug - it doesn't reliably display all the text in dynamically-added select boxes unless you force it to re-render by updating the width.
              // (See https://github.com/SteveSanderson/knockout/issues/312, http://stackoverflow.com/questions/5908494/select-only-shows-first-char-of-selected-option)
              // Also fixes IE7 and IE8 bug that causes selects to be zero width if enclosed by 'if' or 'with'. (See issue #839)
              if (ieVersion) {
                  var originalWidth = selectElement.style.width;
                  selectElement.style.width = 0;
                  selectElement.style.width = originalWidth;
              }
          },
  
          range: function (min, max) {
              min = ko.utils.unwrapObservable(min);
              max = ko.utils.unwrapObservable(max);
              var result = [];
              for (var i = min; i <= max; i++)
                  result.push(i);
              return result;
          },
  
          makeArray: function(arrayLikeObject) {
              var result = [];
              for (var i = 0, j = arrayLikeObject.length; i < j; i++) {
                  result.push(arrayLikeObject[i]);
              };
              return result;
          },
  
          createSymbolOrString: function(identifier) {
              return canUseSymbols ? Symbol(identifier) : identifier;
          },
  
          isIe6 : isIe6,
          isIe7 : isIe7,
          ieVersion : ieVersion,
  
          getFormFields: function(form, fieldName) {
              var fields = ko.utils.makeArray(form.getElementsByTagName("input")).concat(ko.utils.makeArray(form.getElementsByTagName("textarea")));
              var isMatchingField = (typeof fieldName == 'string')
                  ? function(field) { return field.name === fieldName }
                  : function(field) { return fieldName.test(field.name) }; // Treat fieldName as regex or object containing predicate
              var matches = [];
              for (var i = fields.length - 1; i >= 0; i--) {
                  if (isMatchingField(fields[i]))
                      matches.push(fields[i]);
              };
              return matches;
          },
  
          parseJson: function (jsonString) {
              if (typeof jsonString == "string") {
                  jsonString = ko.utils.stringTrim(jsonString);
                  if (jsonString) {
                      if (JSON && JSON.parse) // Use native parsing where available
                          return JSON.parse(jsonString);
                      return (new Function("return " + jsonString))(); // Fallback on less safe parsing for older browsers
                  }
              }
              return null;
          },
  
          stringifyJson: function (data, replacer, space) {   // replacer and space are optional
              if (!JSON || !JSON.stringify)
                  throw new Error("Cannot find JSON.stringify(). Some browsers (e.g., IE < 8) don't support it natively, but you can overcome this by adding a script reference to json2.js, downloadable from http://www.json.org/json2.js");
              return JSON.stringify(ko.utils.unwrapObservable(data), replacer, space);
          },
  
          postJson: function (urlOrForm, data, options) {
              options = options || {};
              var params = options['params'] || {};
              var includeFields = options['includeFields'] || this.fieldsIncludedWithJsonPost;
              var url = urlOrForm;
  
              // If we were given a form, use its 'action' URL and pick out any requested field values
              if((typeof urlOrForm == 'object') && (ko.utils.tagNameLower(urlOrForm) === "form")) {
                  var originalForm = urlOrForm;
                  url = originalForm.action;
                  for (var i = includeFields.length - 1; i >= 0; i--) {
                      var fields = ko.utils.getFormFields(originalForm, includeFields[i]);
                      for (var j = fields.length - 1; j >= 0; j--)
                          params[fields[j].name] = fields[j].value;
                  }
              }
  
              data = ko.utils.unwrapObservable(data);
              var form = document.createElement("form");
              form.style.display = "none";
              form.action = url;
              form.method = "post";
              for (var key in data) {
                  // Since 'data' this is a model object, we include all properties including those inherited from its prototype
                  var input = document.createElement("input");
                  input.type = "hidden";
                  input.name = key;
                  input.value = ko.utils.stringifyJson(ko.utils.unwrapObservable(data[key]));
                  form.appendChild(input);
              }
              objectForEach(params, function(key, value) {
                  var input = document.createElement("input");
                  input.type = "hidden";
                  input.name = key;
                  input.value = value;
                  form.appendChild(input);
              });
              document.body.appendChild(form);
              options['submitter'] ? options['submitter'](form) : form.submit();
              setTimeout(function () { form.parentNode.removeChild(form); }, 0);
          }
      }
  }());
  
  ko.exportSymbol('utils', ko.utils);
  ko.exportSymbol('utils.arrayForEach', ko.utils.arrayForEach);
  ko.exportSymbol('utils.arrayFirst', ko.utils.arrayFirst);
  ko.exportSymbol('utils.arrayFilter', ko.utils.arrayFilter);
  ko.exportSymbol('utils.arrayGetDistinctValues', ko.utils.arrayGetDistinctValues);
  ko.exportSymbol('utils.arrayIndexOf', ko.utils.arrayIndexOf);
  ko.exportSymbol('utils.arrayMap', ko.utils.arrayMap);
  ko.exportSymbol('utils.arrayPushAll', ko.utils.arrayPushAll);
  ko.exportSymbol('utils.arrayRemoveItem', ko.utils.arrayRemoveItem);
  ko.exportSymbol('utils.extend', ko.utils.extend);
  ko.exportSymbol('utils.fieldsIncludedWithJsonPost', ko.utils.fieldsIncludedWithJsonPost);
  ko.exportSymbol('utils.getFormFields', ko.utils.getFormFields);
  ko.exportSymbol('utils.peekObservable', ko.utils.peekObservable);
  ko.exportSymbol('utils.postJson', ko.utils.postJson);
  ko.exportSymbol('utils.parseJson', ko.utils.parseJson);
  ko.exportSymbol('utils.registerEventHandler', ko.utils.registerEventHandler);
  ko.exportSymbol('utils.stringifyJson', ko.utils.stringifyJson);
  ko.exportSymbol('utils.range', ko.utils.range);
  ko.exportSymbol('utils.toggleDomNodeCssClass', ko.utils.toggleDomNodeCssClass);
  ko.exportSymbol('utils.triggerEvent', ko.utils.triggerEvent);
  ko.exportSymbol('utils.unwrapObservable', ko.utils.unwrapObservable);
  ko.exportSymbol('utils.objectForEach', ko.utils.objectForEach);
  ko.exportSymbol('utils.addOrRemoveItem', ko.utils.addOrRemoveItem);
  ko.exportSymbol('utils.setTextContent', ko.utils.setTextContent);
  ko.exportSymbol('unwrap', ko.utils.unwrapObservable); // Convenient shorthand, because this is used so commonly
  
  if (!Function.prototype['bind']) {
      // Function.prototype.bind is a standard part of ECMAScript 5th Edition (December 2009, http://www.ecma-international.org/publications/files/ECMA-ST/ECMA-262.pdf)
      // In case the browser doesn't implement it natively, provide a JavaScript implementation. This implementation is based on the one in prototype.js
      Function.prototype['bind'] = function (object) {
          var originalFunction = this;
          if (arguments.length === 1) {
              return function () {
                  return originalFunction.apply(object, arguments);
              };
          } else {
              var partialArgs = Array.prototype.slice.call(arguments, 1);
              return function () {
                  var args = partialArgs.slice(0);
                  args.push.apply(args, arguments);
                  return originalFunction.apply(object, args);
              };
          }
      };
  }
  
  ko.utils.domData = new (function () {
      var uniqueId = 0;
      var dataStoreKeyExpandoPropertyName = "__ko__" + (new Date).getTime();
      var dataStore = {};
  
      function getAll(node, createIfNotFound) {
          var dataStoreKey = node[dataStoreKeyExpandoPropertyName];
          var hasExistingDataStore = dataStoreKey && (dataStoreKey !== "null") && dataStore[dataStoreKey];
          if (!hasExistingDataStore) {
              if (!createIfNotFound)
                  return undefined;
              dataStoreKey = node[dataStoreKeyExpandoPropertyName] = "ko" + uniqueId++;
              dataStore[dataStoreKey] = {};
          }
          return dataStore[dataStoreKey];
      }
  
      return {
          get: function (node, key) {
              var allDataForNode = getAll(node, false);
              return allDataForNode === undefined ? undefined : allDataForNode[key];
          },
          set: function (node, key, value) {
              if (value === undefined) {
                  // Make sure we don't actually create a new domData key if we are actually deleting a value
                  if (getAll(node, false) === undefined)
                      return;
              }
              var allDataForNode = getAll(node, true);
              allDataForNode[key] = value;
          },
          clear: function (node) {
              var dataStoreKey = node[dataStoreKeyExpandoPropertyName];
              if (dataStoreKey) {
                  delete dataStore[dataStoreKey];
                  node[dataStoreKeyExpandoPropertyName] = null;
                  return true; // Exposing "did clean" flag purely so specs can infer whether things have been cleaned up as intended
              }
              return false;
          },
  
          nextKey: function () {
              return (uniqueId++) + dataStoreKeyExpandoPropertyName;
          }
      };
  })();
  
  ko.exportSymbol('utils.domData', ko.utils.domData);
  ko.exportSymbol('utils.domData.clear', ko.utils.domData.clear); // Exporting only so specs can clear up after themselves fully
  
  ko.utils.domNodeDisposal = new (function () {
      var domDataKey = ko.utils.domData.nextKey();
      var cleanableNodeTypes = { 1: true, 8: true, 9: true };       // Element, Comment, Document
      var cleanableNodeTypesWithDescendants = { 1: true, 9: true }; // Element, Document
  
      function getDisposeCallbacksCollection(node, createIfNotFound) {
          var allDisposeCallbacks = ko.utils.domData.get(node, domDataKey);
          if ((allDisposeCallbacks === undefined) && createIfNotFound) {
              allDisposeCallbacks = [];
              ko.utils.domData.set(node, domDataKey, allDisposeCallbacks);
          }
          return allDisposeCallbacks;
      }
      function destroyCallbacksCollection(node) {
          ko.utils.domData.set(node, domDataKey, undefined);
      }
  
      function cleanSingleNode(node) {
          // Run all the dispose callbacks
          var callbacks = getDisposeCallbacksCollection(node, false);
          if (callbacks) {
              callbacks = callbacks.slice(0); // Clone, as the array may be modified during iteration (typically, callbacks will remove themselves)
              for (var i = 0; i < callbacks.length; i++)
                  callbacks[i](node);
          }
  
          // Erase the DOM data
          ko.utils.domData.clear(node);
  
          // Perform cleanup needed by external libraries (currently only jQuery, but can be extended)
          ko.utils.domNodeDisposal["cleanExternalData"](node);
  
          // Clear any immediate-child comment nodes, as these wouldn't have been found by
          // node.getElementsByTagName("*") in cleanNode() (comment nodes aren't elements)
          if (cleanableNodeTypesWithDescendants[node.nodeType])
              cleanImmediateCommentTypeChildren(node);
      }
  
      function cleanImmediateCommentTypeChildren(nodeWithChildren) {
          var child, nextChild = nodeWithChildren.firstChild;
          while (child = nextChild) {
              nextChild = child.nextSibling;
              if (child.nodeType === 8)
                  cleanSingleNode(child);
          }
      }
  
      return {
          addDisposeCallback : function(node, callback) {
              if (typeof callback != "function")
                  throw new Error("Callback must be a function");
              getDisposeCallbacksCollection(node, true).push(callback);
          },
  
          removeDisposeCallback : function(node, callback) {
              var callbacksCollection = getDisposeCallbacksCollection(node, false);
              if (callbacksCollection) {
                  ko.utils.arrayRemoveItem(callbacksCollection, callback);
                  if (callbacksCollection.length == 0)
                      destroyCallbacksCollection(node);
              }
          },
  
          cleanNode : function(node) {
              // First clean this node, where applicable
              if (cleanableNodeTypes[node.nodeType]) {
                  cleanSingleNode(node);
  
                  // ... then its descendants, where applicable
                  if (cleanableNodeTypesWithDescendants[node.nodeType]) {
                      // Clone the descendants list in case it changes during iteration
                      var descendants = [];
                      ko.utils.arrayPushAll(descendants, node.getElementsByTagName("*"));
                      for (var i = 0, j = descendants.length; i < j; i++)
                          cleanSingleNode(descendants[i]);
                  }
              }
              return node;
          },
  
          removeNode : function(node) {
              ko.cleanNode(node);
              if (node.parentNode)
                  node.parentNode.removeChild(node);
          },
  
          "cleanExternalData" : function (node) {
              // Special support for jQuery here because it's so commonly used.
              // Many jQuery plugins (including jquery.tmpl) store data using jQuery's equivalent of domData
              // so notify it to tear down any resources associated with the node & descendants here.
              if (jQueryInstance && (typeof jQueryInstance['cleanData'] == "function"))
                  jQueryInstance['cleanData']([node]);
          }
      };
  })();
  ko.cleanNode = ko.utils.domNodeDisposal.cleanNode; // Shorthand name for convenience
  ko.removeNode = ko.utils.domNodeDisposal.removeNode; // Shorthand name for convenience
  ko.exportSymbol('cleanNode', ko.cleanNode);
  ko.exportSymbol('removeNode', ko.removeNode);
  ko.exportSymbol('utils.domNodeDisposal', ko.utils.domNodeDisposal);
  ko.exportSymbol('utils.domNodeDisposal.addDisposeCallback', ko.utils.domNodeDisposal.addDisposeCallback);
  ko.exportSymbol('utils.domNodeDisposal.removeDisposeCallback', ko.utils.domNodeDisposal.removeDisposeCallback);
  (function () {
      var none = [0, "", ""],
          table = [1, "<table>", "</table>"],
          tbody = [2, "<table><tbody>", "</tbody></table>"],
          tr = [3, "<table><tbody><tr>", "</tr></tbody></table>"],
          select = [1, "<select multiple='multiple'>", "</select>"],
          lookup = {
              'thead': table,
              'tbody': table,
              'tfoot': table,
              'tr': tbody,
              'td': tr,
              'th': tr,
              'option': select,
              'optgroup': select
          },
  
          // This is needed for old IE if you're *not* using either jQuery or innerShiv. Doesn't affect other cases.
          mayRequireCreateElementHack = ko.utils.ieVersion <= 8;
  
      function getWrap(tags) {
          var m = tags.match(/^<([a-z]+)[ >]/);
          return (m && lookup[m[1]]) || none;
      }
  
      function simpleHtmlParse(html, documentContext) {
          documentContext || (documentContext = document);
          var windowContext = documentContext['parentWindow'] || documentContext['defaultView'] || window;
  
          // Based on jQuery's "clean" function, but only accounting for table-related elements.
          // If you have referenced jQuery, this won't be used anyway - KO will use jQuery's "clean" function directly
  
          // Note that there's still an issue in IE < 9 whereby it will discard comment nodes that are the first child of
          // a descendant node. For example: "<div><!-- mycomment -->abc</div>" will get parsed as "<div>abc</div>"
          // This won't affect anyone who has referenced jQuery, and there's always the workaround of inserting a dummy node
          // (possibly a text node) in front of the comment. So, KO does not attempt to workaround this IE issue automatically at present.
  
          // Trim whitespace, otherwise indexOf won't work as expected
          var tags = ko.utils.stringTrim(html).toLowerCase(), div = documentContext.createElement("div"),
              wrap = getWrap(tags),
              depth = wrap[0];
  
          // Go to html and back, then peel off extra wrappers
          // Note that we always prefix with some dummy text, because otherwise, IE<9 will strip out leading comment nodes in descendants. Total madness.
          var markup = "ignored<div>" + wrap[1] + html + wrap[2] + "</div>";
          if (typeof windowContext['innerShiv'] == "function") {
              // Note that innerShiv is deprecated in favour of html5shiv. We should consider adding
              // support for html5shiv (except if no explicit support is needed, e.g., if html5shiv
              // somehow shims the native APIs so it just works anyway)
              div.appendChild(windowContext['innerShiv'](markup));
          } else {
              if (mayRequireCreateElementHack) {
                  // The document.createElement('my-element') trick to enable custom elements in IE6-8
                  // only works if we assign innerHTML on an element associated with that document.
                  documentContext.appendChild(div);
              }
  
              div.innerHTML = markup;
  
              if (mayRequireCreateElementHack) {
                  div.parentNode.removeChild(div);
              }
          }
  
          // Move to the right depth
          while (depth--)
              div = div.lastChild;
  
          return ko.utils.makeArray(div.lastChild.childNodes);
      }
  
      function jQueryHtmlParse(html, documentContext) {
          // jQuery's "parseHTML" function was introduced in jQuery 1.8.0 and is a documented public API.
          if (jQueryInstance['parseHTML']) {
              return jQueryInstance['parseHTML'](html, documentContext) || []; // Ensure we always return an array and never null
          } else {
              // For jQuery < 1.8.0, we fall back on the undocumented internal "clean" function.
              var elems = jQueryInstance['clean']([html], documentContext);
  
              // As of jQuery 1.7.1, jQuery parses the HTML by appending it to some dummy parent nodes held in an in-memory document fragment.
              // Unfortunately, it never clears the dummy parent nodes from the document fragment, so it leaks memory over time.
              // Fix this by finding the top-most dummy parent element, and detaching it from its owner fragment.
              if (elems && elems[0]) {
                  // Find the top-most parent element that's a direct child of a document fragment
                  var elem = elems[0];
                  while (elem.parentNode && elem.parentNode.nodeType !== 11 /* i.e., DocumentFragment */)
                      elem = elem.parentNode;
                  // ... then detach it
                  if (elem.parentNode)
                      elem.parentNode.removeChild(elem);
              }
  
              return elems;
          }
      }
  
      ko.utils.parseHtmlFragment = function(html, documentContext) {
          return jQueryInstance ?
              jQueryHtmlParse(html, documentContext) :   // As below, benefit from jQuery's optimisations where possible
              simpleHtmlParse(html, documentContext);  // ... otherwise, this simple logic will do in most common cases.
      };
  
      ko.utils.setHtml = function(node, html) {
          ko.utils.emptyDomNode(node);
  
          // There's no legitimate reason to display a stringified observable without unwrapping it, so we'll unwrap it
          html = ko.utils.unwrapObservable(html);
  
          if ((html !== null) && (html !== undefined)) {
              if (typeof html != 'string')
                  html = html.toString();
  
              // jQuery contains a lot of sophisticated code to parse arbitrary HTML fragments,
              // for example <tr> elements which are not normally allowed to exist on their own.
              // If you've referenced jQuery we'll use that rather than duplicating its code.
              if (jQueryInstance) {
                  jQueryInstance(node)['html'](html);
              } else {
                  // ... otherwise, use KO's own parsing logic.
                  var parsedNodes = ko.utils.parseHtmlFragment(html, node.ownerDocument);
                  for (var i = 0; i < parsedNodes.length; i++)
                      node.appendChild(parsedNodes[i]);
              }
          }
      };
  })();
  
  ko.exportSymbol('utils.parseHtmlFragment', ko.utils.parseHtmlFragment);
  ko.exportSymbol('utils.setHtml', ko.utils.setHtml);
  
  ko.memoization = (function () {
      var memos = {};
  
      function randomMax8HexChars() {
          return (((1 + Math.random()) * 0x100000000) | 0).toString(16).substring(1);
      }
      function generateRandomId() {
          return randomMax8HexChars() + randomMax8HexChars();
      }
      function findMemoNodes(rootNode, appendToArray) {
          if (!rootNode)
              return;
          if (rootNode.nodeType == 8) {
              var memoId = ko.memoization.parseMemoText(rootNode.nodeValue);
              if (memoId != null)
                  appendToArray.push({ domNode: rootNode, memoId: memoId });
          } else if (rootNode.nodeType == 1) {
              for (var i = 0, childNodes = rootNode.childNodes, j = childNodes.length; i < j; i++)
                  findMemoNodes(childNodes[i], appendToArray);
          }
      }
  
      return {
          memoize: function (callback) {
              if (typeof callback != "function")
                  throw new Error("You can only pass a function to ko.memoization.memoize()");
              var memoId = generateRandomId();
              memos[memoId] = callback;
              return "<!--[ko_memo:" + memoId + "]-->";
          },
  
          unmemoize: function (memoId, callbackParams) {
              var callback = memos[memoId];
              if (callback === undefined)
                  throw new Error("Couldn't find any memo with ID " + memoId + ". Perhaps it's already been unmemoized.");
              try {
                  callback.apply(null, callbackParams || []);
                  return true;
              }
              finally { delete memos[memoId]; }
          },
  
          unmemoizeDomNodeAndDescendants: function (domNode, extraCallbackParamsArray) {
              var memos = [];
              findMemoNodes(domNode, memos);
              for (var i = 0, j = memos.length; i < j; i++) {
                  var node = memos[i].domNode;
                  var combinedParams = [node];
                  if (extraCallbackParamsArray)
                      ko.utils.arrayPushAll(combinedParams, extraCallbackParamsArray);
                  ko.memoization.unmemoize(memos[i].memoId, combinedParams);
                  node.nodeValue = ""; // Neuter this node so we don't try to unmemoize it again
                  if (node.parentNode)
                      node.parentNode.removeChild(node); // If possible, erase it totally (not always possible - someone else might just hold a reference to it then call unmemoizeDomNodeAndDescendants again)
              }
          },
  
          parseMemoText: function (memoText) {
              var match = memoText.match(/^\[ko_memo\:(.*?)\]$/);
              return match ? match[1] : null;
          }
      };
  })();
  
  ko.exportSymbol('memoization', ko.memoization);
  ko.exportSymbol('memoization.memoize', ko.memoization.memoize);
  ko.exportSymbol('memoization.unmemoize', ko.memoization.unmemoize);
  ko.exportSymbol('memoization.parseMemoText', ko.memoization.parseMemoText);
  ko.exportSymbol('memoization.unmemoizeDomNodeAndDescendants', ko.memoization.unmemoizeDomNodeAndDescendants);
  ko.tasks = (function () {
      var scheduler,
          taskQueue = [],
          taskQueueLength = 0,
          nextHandle = 1,
          nextIndexToProcess = 0;
  
      if (window['MutationObserver']) {
          // Chrome 27+, Firefox 14+, IE 11+, Opera 15+, Safari 6.1+
          // From https://github.com/petkaantonov/bluebird * Copyright (c) 2014 Petka Antonov * License: MIT
          scheduler = (function (callback) {
              var div = document.createElement("div");
              new MutationObserver(callback).observe(div, {attributes: true});
              return function () { div.classList.toggle("foo"); };
          })(scheduledProcess);
      } else if (document && "onreadystatechange" in document.createElement("script")) {
          // IE 6-10
          // From https://github.com/YuzuJS/setImmediate * Copyright (c) 2012 Barnesandnoble.com, llc, Donavon West, and Domenic Denicola * License: MIT
          scheduler = function (callback) {
              var script = document.createElement("script");
              script.onreadystatechange = function () {
                  script.onreadystatechange = null;
                  document.documentElement.removeChild(script);
                  script = null;
                  callback();
              };
              document.documentElement.appendChild(script);
          };
      } else {
          scheduler = function (callback) {
              setTimeout(callback, 0);
          };
      }
  
      function processTasks() {
          if (taskQueueLength) {
              // Each mark represents the end of a logical group of tasks and the number of these groups is
              // limited to prevent unchecked recursion.
              var mark = taskQueueLength, countMarks = 0;
  
              // nextIndexToProcess keeps track of where we are in the queue; processTasks can be called recursively without issue
              for (var task; nextIndexToProcess < taskQueueLength; ) {
                  if (task = taskQueue[nextIndexToProcess++]) {
                      if (nextIndexToProcess > mark) {
                          if (++countMarks >= 5000) {
                              nextIndexToProcess = taskQueueLength;   // skip all tasks remaining in the queue since any of them could be causing the recursion
                              ko.utils.deferError(Error("'Too much recursion' after processing " + countMarks + " task groups."));
                              break;
                          }
                          mark = taskQueueLength;
                      }
                      try {
                          task();
                      } catch (ex) {
                          ko.utils.deferError(ex);
                      }
                  }
              }
          }
      }
  
      function scheduledProcess() {
          processTasks();
  
          // Reset the queue
          nextIndexToProcess = taskQueueLength = taskQueue.length = 0;
      }
  
      function scheduleTaskProcessing() {
          ko.tasks['scheduler'](scheduledProcess);
      }
  
      var tasks = {
          'scheduler': scheduler,     // Allow overriding the scheduler
  
          schedule: function (func) {
              if (!taskQueueLength) {
                  scheduleTaskProcessing();
              }
  
              taskQueue[taskQueueLength++] = func;
              return nextHandle++;
          },
  
          cancel: function (handle) {
              var index = handle - (nextHandle - taskQueueLength);
              if (index >= nextIndexToProcess && index < taskQueueLength) {
                  taskQueue[index] = null;
              }
          },
  
          // For testing only: reset the queue and return the previous queue length
          'resetForTesting': function () {
              var length = taskQueueLength - nextIndexToProcess;
              nextIndexToProcess = taskQueueLength = taskQueue.length = 0;
              return length;
          },
  
          runEarly: processTasks
      };
  
      return tasks;
  })();
  
  ko.exportSymbol('tasks', ko.tasks);
  ko.exportSymbol('tasks.schedule', ko.tasks.schedule);
  //ko.exportSymbol('tasks.cancel', ko.tasks.cancel);  "cancel" isn't minified
  ko.exportSymbol('tasks.runEarly', ko.tasks.runEarly);
  ko.extenders = {
      'throttle': function(target, timeout) {
          // Throttling means two things:
  
          // (1) For dependent observables, we throttle *evaluations* so that, no matter how fast its dependencies
          //     notify updates, the target doesn't re-evaluate (and hence doesn't notify) faster than a certain rate
          target['throttleEvaluation'] = timeout;
  
          // (2) For writable targets (observables, or writable dependent observables), we throttle *writes*
          //     so the target cannot change value synchronously or faster than a certain rate
          var writeTimeoutInstance = null;
          return ko.dependentObservable({
              'read': target,
              'write': function(value) {
                  clearTimeout(writeTimeoutInstance);
                  writeTimeoutInstance = ko.utils.setTimeout(function() {
                      target(value);
                  }, timeout);
              }
          });
      },
  
      'rateLimit': function(target, options) {
          var timeout, method, limitFunction;
  
          if (typeof options == 'number') {
              timeout = options;
          } else {
              timeout = options['timeout'];
              method = options['method'];
          }
  
          // rateLimit supersedes deferred updates
          target._deferUpdates = false;
  
          limitFunction = method == 'notifyWhenChangesStop' ?  debounce : throttle;
          target.limit(function(callback) {
              return limitFunction(callback, timeout);
          });
      },
  
      'deferred': function(target, options) {
          if (options !== true) {
              throw new Error('The \'deferred\' extender only accepts the value \'true\', because it is not supported to turn deferral off once enabled.')
          }
  
          if (!target._deferUpdates) {
              target._deferUpdates = true;
              target.limit(function (callback) {
                  var handle,
                      ignoreUpdates = false;
                  return function () {
                      if (!ignoreUpdates) {
                          ko.tasks.cancel(handle);
                          handle = ko.tasks.schedule(callback);
  
                          try {
                              ignoreUpdates = true;
                              target['notifySubscribers'](undefined, 'dirty');
                          } finally {
                              ignoreUpdates = false;
                          }
                      }
                  };
              });
          }
      },
  
      'notify': function(target, notifyWhen) {
          target["equalityComparer"] = notifyWhen == "always" ?
              null :  // null equalityComparer means to always notify
              valuesArePrimitiveAndEqual;
      }
  };
  
  var primitiveTypes = { 'undefined':1, 'boolean':1, 'number':1, 'string':1 };
  function valuesArePrimitiveAndEqual(a, b) {
      var oldValueIsPrimitive = (a === null) || (typeof(a) in primitiveTypes);
      return oldValueIsPrimitive ? (a === b) : false;
  }
  
  function throttle(callback, timeout) {
      var timeoutInstance;
      return function () {
          if (!timeoutInstance) {
              timeoutInstance = ko.utils.setTimeout(function () {
                  timeoutInstance = undefined;
                  callback();
              }, timeout);
          }
      };
  }
  
  function debounce(callback, timeout) {
      var timeoutInstance;
      return function () {
          clearTimeout(timeoutInstance);
          timeoutInstance = ko.utils.setTimeout(callback, timeout);
      };
  }
  
  function applyExtenders(requestedExtenders) {
      var target = this;
      if (requestedExtenders) {
          ko.utils.objectForEach(requestedExtenders, function(key, value) {
              var extenderHandler = ko.extenders[key];
              if (typeof extenderHandler == 'function') {
                  target = extenderHandler(target, value) || target;
              }
          });
      }
      return target;
  }
  
  ko.exportSymbol('extenders', ko.extenders);
  
  ko.subscription = function (target, callback, disposeCallback) {
      this._target = target;
      this.callback = callback;
      this.disposeCallback = disposeCallback;
      this.isDisposed = false;
      ko.exportProperty(this, 'dispose', this.dispose);
  };
  ko.subscription.prototype.dispose = function () {
      this.isDisposed = true;
      this.disposeCallback();
  };
  
  ko.subscribable = function () {
      ko.utils.setPrototypeOfOrExtend(this, ko_subscribable_fn);
      ko_subscribable_fn.init(this);
  }
  
  var defaultEvent = "change";
  
  // Moved out of "limit" to avoid the extra closure
  function limitNotifySubscribers(value, event) {
      if (!event || event === defaultEvent) {
          this._limitChange(value);
      } else if (event === 'beforeChange') {
          this._limitBeforeChange(value);
      } else {
          this._origNotifySubscribers(value, event);
      }
  }
  
  var ko_subscribable_fn = {
      init: function(instance) {
          instance._subscriptions = { "change": [] };
          instance._versionNumber = 1;
      },
  
      subscribe: function (callback, callbackTarget, event) {
          var self = this;
  
          event = event || defaultEvent;
          var boundCallback = callbackTarget ? callback.bind(callbackTarget) : callback;
  
          var subscription = new ko.subscription(self, boundCallback, function () {
              ko.utils.arrayRemoveItem(self._subscriptions[event], subscription);
              if (self.afterSubscriptionRemove)
                  self.afterSubscriptionRemove(event);
          });
  
          if (self.beforeSubscriptionAdd)
              self.beforeSubscriptionAdd(event);
  
          if (!self._subscriptions[event])
              self._subscriptions[event] = [];
          self._subscriptions[event].push(subscription);
  
          return subscription;
      },
  
      "notifySubscribers": function (valueToNotify, event) {
          event = event || defaultEvent;
          if (event === defaultEvent) {
              this.updateVersion();
          }
          if (this.hasSubscriptionsForEvent(event)) {
              var subs = event === defaultEvent && this._changeSubscriptions || this._subscriptions[event].slice(0);
              try {
                  ko.dependencyDetection.begin(); // Begin suppressing dependency detection (by setting the top frame to undefined)
                  for (var i = 0, subscription; subscription = subs[i]; ++i) {
                      // In case a subscription was disposed during the arrayForEach cycle, check
                      // for isDisposed on each subscription before invoking its callback
                      if (!subscription.isDisposed)
                          subscription.callback(valueToNotify);
                  }
              } finally {
                  ko.dependencyDetection.end(); // End suppressing dependency detection
              }
          }
      },
  
      getVersion: function () {
          return this._versionNumber;
      },
  
      hasChanged: function (versionToCheck) {
          return this.getVersion() !== versionToCheck;
      },
  
      updateVersion: function () {
          ++this._versionNumber;
      },
  
      limit: function(limitFunction) {
          var self = this, selfIsObservable = ko.isObservable(self),
              ignoreBeforeChange, notifyNextChange, previousValue, pendingValue, beforeChange = 'beforeChange';
  
          if (!self._origNotifySubscribers) {
              self._origNotifySubscribers = self["notifySubscribers"];
              self["notifySubscribers"] = limitNotifySubscribers;
          }
  
          var finish = limitFunction(function() {
              self._notificationIsPending = false;
  
              // If an observable provided a reference to itself, access it to get the latest value.
              // This allows computed observables to delay calculating their value until needed.
              if (selfIsObservable && pendingValue === self) {
                  pendingValue = self._evalIfChanged ? self._evalIfChanged() : self();
              }
              var shouldNotify = notifyNextChange || self.isDifferent(previousValue, pendingValue);
  
              notifyNextChange = ignoreBeforeChange = false;
  
              if (shouldNotify) {
                  self._origNotifySubscribers(previousValue = pendingValue);
              }
          });
  
          self._limitChange = function(value) {
              self._changeSubscriptions = self._subscriptions[defaultEvent].slice(0);
              self._notificationIsPending = ignoreBeforeChange = true;
              pendingValue = value;
              finish();
          };
          self._limitBeforeChange = function(value) {
              if (!ignoreBeforeChange) {
                  previousValue = value;
                  self._origNotifySubscribers(value, beforeChange);
              }
          };
          self._notifyNextChangeIfValueIsDifferent = function() {
              if (self.isDifferent(previousValue, self.peek(true /*evaluate*/))) {
                  notifyNextChange = true;
              }
          };
      },
  
      hasSubscriptionsForEvent: function(event) {
          return this._subscriptions[event] && this._subscriptions[event].length;
      },
  
      getSubscriptionsCount: function (event) {
          if (event) {
              return this._subscriptions[event] && this._subscriptions[event].length || 0;
          } else {
              var total = 0;
              ko.utils.objectForEach(this._subscriptions, function(eventName, subscriptions) {
                  if (eventName !== 'dirty')
                      total += subscriptions.length;
              });
              return total;
          }
      },
  
      isDifferent: function(oldValue, newValue) {
          return !this['equalityComparer'] || !this['equalityComparer'](oldValue, newValue);
      },
  
      extend: applyExtenders
  };
  
  ko.exportProperty(ko_subscribable_fn, 'subscribe', ko_subscribable_fn.subscribe);
  ko.exportProperty(ko_subscribable_fn, 'extend', ko_subscribable_fn.extend);
  ko.exportProperty(ko_subscribable_fn, 'getSubscriptionsCount', ko_subscribable_fn.getSubscriptionsCount);
  
  // For browsers that support proto assignment, we overwrite the prototype of each
  // observable instance. Since observables are functions, we need Function.prototype
  // to still be in the prototype chain.
  if (ko.utils.canSetPrototype) {
      ko.utils.setPrototypeOf(ko_subscribable_fn, Function.prototype);
  }
  
  ko.subscribable['fn'] = ko_subscribable_fn;
  
  
  ko.isSubscribable = function (instance) {
      return instance != null && typeof instance.subscribe == "function" && typeof instance["notifySubscribers"] == "function";
  };
  
  ko.exportSymbol('subscribable', ko.subscribable);
  ko.exportSymbol('isSubscribable', ko.isSubscribable);
  
  ko.computedContext = ko.dependencyDetection = (function () {
      var outerFrames = [],
          currentFrame,
          lastId = 0;
  
      // Return a unique ID that can be assigned to an observable for dependency tracking.
      // Theoretically, you could eventually overflow the number storage size, resulting
      // in duplicate IDs. But in JavaScript, the largest exact integral value is 2^53
      // or 9,007,199,254,740,992. If you created 1,000,000 IDs per second, it would
      // take over 285 years to reach that number.
      // Reference http://blog.vjeux.com/2010/javascript/javascript-max_int-number-limits.html
      function getId() {
          return ++lastId;
      }
  
      function begin(options) {
          outerFrames.push(currentFrame);
          currentFrame = options;
      }
  
      function end() {
          currentFrame = outerFrames.pop();
      }
  
      return {
          begin: begin,
  
          end: end,
  
          registerDependency: function (subscribable) {
              if (currentFrame) {
                  if (!ko.isSubscribable(subscribable))
                      throw new Error("Only subscribable things can act as dependencies");
                  currentFrame.callback.call(currentFrame.callbackTarget, subscribable, subscribable._id || (subscribable._id = getId()));
              }
          },
  
          ignore: function (callback, callbackTarget, callbackArgs) {
              try {
                  begin();
                  return callback.apply(callbackTarget, callbackArgs || []);
              } finally {
                  end();
              }
          },
  
          getDependenciesCount: function () {
              if (currentFrame)
                  return currentFrame.computed.getDependenciesCount();
          },
  
          isInitial: function() {
              if (currentFrame)
                  return currentFrame.isInitial;
          }
      };
  })();
  
  ko.exportSymbol('computedContext', ko.computedContext);
  ko.exportSymbol('computedContext.getDependenciesCount', ko.computedContext.getDependenciesCount);
  ko.exportSymbol('computedContext.isInitial', ko.computedContext.isInitial);
  
  ko.exportSymbol('ignoreDependencies', ko.ignoreDependencies = ko.dependencyDetection.ignore);
  var observableLatestValue = ko.utils.createSymbolOrString('_latestValue');
  
  ko.observable = function (initialValue) {
      function observable() {
          if (arguments.length > 0) {
              // Write
  
              // Ignore writes if the value hasn't changed
              if (observable.isDifferent(observable[observableLatestValue], arguments[0])) {
                  observable.valueWillMutate();
                  observable[observableLatestValue] = arguments[0];
                  observable.valueHasMutated();
              }
              return this; // Permits chained assignments
          }
          else {
              // Read
              ko.dependencyDetection.registerDependency(observable); // The caller only needs to be notified of changes if they did a "read" operation
              return observable[observableLatestValue];
          }
      }
  
      observable[observableLatestValue] = initialValue;
  
      // Inherit from 'subscribable'
      if (!ko.utils.canSetPrototype) {
          // 'subscribable' won't be on the prototype chain unless we put it there directly
          ko.utils.extend(observable, ko.subscribable['fn']);
      }
      ko.subscribable['fn'].init(observable);
  
      // Inherit from 'observable'
      ko.utils.setPrototypeOfOrExtend(observable, observableFn);
  
      if (ko.options['deferUpdates']) {
          ko.extenders['deferred'](observable, true);
      }
  
      return observable;
  }
  
  // Define prototype for observables
  var observableFn = {
      'equalityComparer': valuesArePrimitiveAndEqual,
      peek: function() { return this[observableLatestValue]; },
      valueHasMutated: function () { this['notifySubscribers'](this[observableLatestValue]); },
      valueWillMutate: function () { this['notifySubscribers'](this[observableLatestValue], 'beforeChange'); }
  };
  
  // Note that for browsers that don't support proto assignment, the
  // inheritance chain is created manually in the ko.observable constructor
  if (ko.utils.canSetPrototype) {
      ko.utils.setPrototypeOf(observableFn, ko.subscribable['fn']);
  }
  
  var protoProperty = ko.observable.protoProperty = '__ko_proto__';
  observableFn[protoProperty] = ko.observable;
  
  ko.hasPrototype = function(instance, prototype) {
      if ((instance === null) || (instance === undefined) || (instance[protoProperty] === undefined)) return false;
      if (instance[protoProperty] === prototype) return true;
      return ko.hasPrototype(instance[protoProperty], prototype); // Walk the prototype chain
  };
  
  ko.isObservable = function (instance) {
      return ko.hasPrototype(instance, ko.observable);
  }
  ko.isWriteableObservable = function (instance) {
      // Observable
      if ((typeof instance == 'function') && instance[protoProperty] === ko.observable)
          return true;
      // Writeable dependent observable
      if ((typeof instance == 'function') && (instance[protoProperty] === ko.dependentObservable) && (instance.hasWriteFunction))
          return true;
      // Anything else
      return false;
  }
  
  ko.exportSymbol('observable', ko.observable);
  ko.exportSymbol('isObservable', ko.isObservable);
  ko.exportSymbol('isWriteableObservable', ko.isWriteableObservable);
  ko.exportSymbol('isWritableObservable', ko.isWriteableObservable);
  ko.exportSymbol('observable.fn', observableFn);
  ko.exportProperty(observableFn, 'peek', observableFn.peek);
  ko.exportProperty(observableFn, 'valueHasMutated', observableFn.valueHasMutated);
  ko.exportProperty(observableFn, 'valueWillMutate', observableFn.valueWillMutate);
  ko.observableArray = function (initialValues) {
      initialValues = initialValues || [];
  
      if (typeof initialValues != 'object' || !('length' in initialValues))
          throw new Error("The argument passed when initializing an observable array must be an array, or null, or undefined.");
  
      var result = ko.observable(initialValues);
      ko.utils.setPrototypeOfOrExtend(result, ko.observableArray['fn']);
      return result.extend({'trackArrayChanges':true});
  };
  
  ko.observableArray['fn'] = {
      'remove': function (valueOrPredicate) {
          var underlyingArray = this.peek();
          var removedValues = [];
          var predicate = typeof valueOrPredicate == "function" && !ko.isObservable(valueOrPredicate) ? valueOrPredicate : function (value) { return value === valueOrPredicate; };
          for (var i = 0; i < underlyingArray.length; i++) {
              var value = underlyingArray[i];
              if (predicate(value)) {
                  if (removedValues.length === 0) {
                      this.valueWillMutate();
                  }
                  removedValues.push(value);
                  underlyingArray.splice(i, 1);
                  i--;
              }
          }
          if (removedValues.length) {
              this.valueHasMutated();
          }
          return removedValues;
      },
  
      'removeAll': function (arrayOfValues) {
          // If you passed zero args, we remove everything
          if (arrayOfValues === undefined) {
              var underlyingArray = this.peek();
              var allValues = underlyingArray.slice(0);
              this.valueWillMutate();
              underlyingArray.splice(0, underlyingArray.length);
              this.valueHasMutated();
              return allValues;
          }
          // If you passed an arg, we interpret it as an array of entries to remove
          if (!arrayOfValues)
              return [];
          return this['remove'](function (value) {
              return ko.utils.arrayIndexOf(arrayOfValues, value) >= 0;
          });
      },
  
      'destroy': function (valueOrPredicate) {
          var underlyingArray = this.peek();
          var predicate = typeof valueOrPredicate == "function" && !ko.isObservable(valueOrPredicate) ? valueOrPredicate : function (value) { return value === valueOrPredicate; };
          this.valueWillMutate();
          for (var i = underlyingArray.length - 1; i >= 0; i--) {
              var value = underlyingArray[i];
              if (predicate(value))
                  underlyingArray[i]["_destroy"] = true;
          }
          this.valueHasMutated();
      },
  
      'destroyAll': function (arrayOfValues) {
          // If you passed zero args, we destroy everything
          if (arrayOfValues === undefined)
              return this['destroy'](function() { return true });
  
          // If you passed an arg, we interpret it as an array of entries to destroy
          if (!arrayOfValues)
              return [];
          return this['destroy'](function (value) {
              return ko.utils.arrayIndexOf(arrayOfValues, value) >= 0;
          });
      },
  
      'indexOf': function (item) {
          var underlyingArray = this();
          return ko.utils.arrayIndexOf(underlyingArray, item);
      },
  
      'replace': function(oldItem, newItem) {
          var index = this['indexOf'](oldItem);
          if (index >= 0) {
              this.valueWillMutate();
              this.peek()[index] = newItem;
              this.valueHasMutated();
          }
      }
  };
  
  // Note that for browsers that don't support proto assignment, the
  // inheritance chain is created manually in the ko.observableArray constructor
  if (ko.utils.canSetPrototype) {
      ko.utils.setPrototypeOf(ko.observableArray['fn'], ko.observable['fn']);
  }
  
  // Populate ko.observableArray.fn with read/write functions from native arrays
  // Important: Do not add any additional functions here that may reasonably be used to *read* data from the array
  // because we'll eval them without causing subscriptions, so ko.computed output could end up getting stale
  ko.utils.arrayForEach(["pop", "push", "reverse", "shift", "sort", "splice", "unshift"], function (methodName) {
      ko.observableArray['fn'][methodName] = function () {
          // Use "peek" to avoid creating a subscription in any computed that we're executing in the context of
          // (for consistency with mutating regular observables)
          var underlyingArray = this.peek();
          this.valueWillMutate();
          this.cacheDiffForKnownOperation(underlyingArray, methodName, arguments);
          var methodCallResult = underlyingArray[methodName].apply(underlyingArray, arguments);
          this.valueHasMutated();
          // The native sort and reverse methods return a reference to the array, but it makes more sense to return the observable array instead.
          return methodCallResult === underlyingArray ? this : methodCallResult;
      };
  });
  
  // Populate ko.observableArray.fn with read-only functions from native arrays
  ko.utils.arrayForEach(["slice"], function (methodName) {
      ko.observableArray['fn'][methodName] = function () {
          var underlyingArray = this();
          return underlyingArray[methodName].apply(underlyingArray, arguments);
      };
  });
  
  ko.exportSymbol('observableArray', ko.observableArray);
  var arrayChangeEventName = 'arrayChange';
  ko.extenders['trackArrayChanges'] = function(target, options) {
      // Use the provided options--each call to trackArrayChanges overwrites the previously set options
      target.compareArrayOptions = {};
      if (options && typeof options == "object") {
          ko.utils.extend(target.compareArrayOptions, options);
      }
      target.compareArrayOptions['sparse'] = true;
  
      // Only modify the target observable once
      if (target.cacheDiffForKnownOperation) {
          return;
      }
      var trackingChanges = false,
          cachedDiff = null,
          arrayChangeSubscription,
          pendingNotifications = 0,
          underlyingNotifySubscribersFunction,
          underlyingBeforeSubscriptionAddFunction = target.beforeSubscriptionAdd,
          underlyingAfterSubscriptionRemoveFunction = target.afterSubscriptionRemove;
  
      // Watch "subscribe" calls, and for array change events, ensure change tracking is enabled
      target.beforeSubscriptionAdd = function (event) {
          if (underlyingBeforeSubscriptionAddFunction)
              underlyingBeforeSubscriptionAddFunction.call(target, event);
          if (event === arrayChangeEventName) {
              trackChanges();
          }
      };
      // Watch "dispose" calls, and for array change events, ensure change tracking is disabled when all are disposed
      target.afterSubscriptionRemove = function (event) {
          if (underlyingAfterSubscriptionRemoveFunction)
              underlyingAfterSubscriptionRemoveFunction.call(target, event);
          if (event === arrayChangeEventName && !target.hasSubscriptionsForEvent(arrayChangeEventName)) {
              if (underlyingNotifySubscribersFunction) {
                  target['notifySubscribers'] = underlyingNotifySubscribersFunction;
                  underlyingNotifySubscribersFunction = undefined;
              }
              arrayChangeSubscription.dispose();
              trackingChanges = false;
          }
      };
  
      function trackChanges() {
          // Calling 'trackChanges' multiple times is the same as calling it once
          if (trackingChanges) {
              return;
          }
  
          trackingChanges = true;
  
          // Intercept "notifySubscribers" to track how many times it was called.
          underlyingNotifySubscribersFunction = target['notifySubscribers'];
          target['notifySubscribers'] = function(valueToNotify, event) {
              if (!event || event === defaultEvent) {
                  ++pendingNotifications;
              }
              return underlyingNotifySubscribersFunction.apply(this, arguments);
          };
  
          // Each time the array changes value, capture a clone so that on the next
          // change it's possible to produce a diff
          var previousContents = [].concat(target.peek() || []);
          cachedDiff = null;
          arrayChangeSubscription = target.subscribe(function(currentContents) {
              // Make a copy of the current contents and ensure it's an array
              currentContents = [].concat(currentContents || []);
  
              // Compute the diff and issue notifications, but only if someone is listening
              if (target.hasSubscriptionsForEvent(arrayChangeEventName)) {
                  var changes = getChanges(previousContents, currentContents);
              }
  
              // Eliminate references to the old, removed items, so they can be GCed
              previousContents = currentContents;
              cachedDiff = null;
              pendingNotifications = 0;
  
              if (changes && changes.length) {
                  target['notifySubscribers'](changes, arrayChangeEventName);
              }
          });
      }
  
      function getChanges(previousContents, currentContents) {
          // We try to re-use cached diffs.
          // The scenarios where pendingNotifications > 1 are when using rate-limiting or the Deferred Updates
          // plugin, which without this check would not be compatible with arrayChange notifications. Normally,
          // notifications are issued immediately so we wouldn't be queueing up more than one.
          if (!cachedDiff || pendingNotifications > 1) {
              cachedDiff = ko.utils.compareArrays(previousContents, currentContents, target.compareArrayOptions);
          }
  
          return cachedDiff;
      }
  
      target.cacheDiffForKnownOperation = function(rawArray, operationName, args) {
          // Only run if we're currently tracking changes for this observable array
          // and there aren't any pending deferred notifications.
          if (!trackingChanges || pendingNotifications) {
              return;
          }
          var diff = [],
              arrayLength = rawArray.length,
              argsLength = args.length,
              offset = 0;
  
          function pushDiff(status, value, index) {
              return diff[diff.length] = { 'status': status, 'value': value, 'index': index };
          }
          switch (operationName) {
              case 'push':
                  offset = arrayLength;
              case 'unshift':
                  for (var index = 0; index < argsLength; index++) {
                      pushDiff('added', args[index], offset + index);
                  }
                  break;
  
              case 'pop':
                  offset = arrayLength - 1;
              case 'shift':
                  if (arrayLength) {
                      pushDiff('deleted', rawArray[offset], offset);
                  }
                  break;
  
              case 'splice':
                  // Negative start index means 'from end of array'. After that we clamp to [0...arrayLength].
                  // See https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/splice
                  var startIndex = Math.min(Math.max(0, args[0] < 0 ? arrayLength + args[0] : args[0]), arrayLength),
                      endDeleteIndex = argsLength === 1 ? arrayLength : Math.min(startIndex + (args[1] || 0), arrayLength),
                      endAddIndex = startIndex + argsLength - 2,
                      endIndex = Math.max(endDeleteIndex, endAddIndex),
                      additions = [], deletions = [];
                  for (var index = startIndex, argsIndex = 2; index < endIndex; ++index, ++argsIndex) {
                      if (index < endDeleteIndex)
                          deletions.push(pushDiff('deleted', rawArray[index], index));
                      if (index < endAddIndex)
                          additions.push(pushDiff('added', args[argsIndex], index));
                  }
                  ko.utils.findMovesInArrayComparison(deletions, additions);
                  break;
  
              default:
                  return;
          }
          cachedDiff = diff;
      };
  };
  var computedState = ko.utils.createSymbolOrString('_state');
  
  ko.computed = ko.dependentObservable = function (evaluatorFunctionOrOptions, evaluatorFunctionTarget, options) {
      if (typeof evaluatorFunctionOrOptions === "object") {
          // Single-parameter syntax - everything is on this "options" param
          options = evaluatorFunctionOrOptions;
      } else {
          // Multi-parameter syntax - construct the options according to the params passed
          options = options || {};
          if (evaluatorFunctionOrOptions) {
              options["read"] = evaluatorFunctionOrOptions;
          }
      }
      if (typeof options["read"] != "function")
          throw Error("Pass a function that returns the value of the ko.computed");
  
      var writeFunction = options["write"];
      var state = {
          latestValue: undefined,
          isStale: true,
          isDirty: true,
          isBeingEvaluated: false,
          suppressDisposalUntilDisposeWhenReturnsFalse: false,
          isDisposed: false,
          pure: false,
          isSleeping: false,
          readFunction: options["read"],
          evaluatorFunctionTarget: evaluatorFunctionTarget || options["owner"],
          disposeWhenNodeIsRemoved: options["disposeWhenNodeIsRemoved"] || options.disposeWhenNodeIsRemoved || null,
          disposeWhen: options["disposeWhen"] || options.disposeWhen,
          domNodeDisposalCallback: null,
          dependencyTracking: {},
          dependenciesCount: 0,
          evaluationTimeoutInstance: null
      };
  
      function computedObservable() {
          if (arguments.length > 0) {
              if (typeof writeFunction === "function") {
                  // Writing a value
                  writeFunction.apply(state.evaluatorFunctionTarget, arguments);
              } else {
                  throw new Error("Cannot write a value to a ko.computed unless you specify a 'write' option. If you wish to read the current value, don't pass any parameters.");
              }
              return this; // Permits chained assignments
          } else {
              // Reading the value
              ko.dependencyDetection.registerDependency(computedObservable);
              if (state.isDirty || (state.isSleeping && computedObservable.haveDependenciesChanged())) {
                  computedObservable.evaluateImmediate();
              }
              return state.latestValue;
          }
      }
  
      computedObservable[computedState] = state;
      computedObservable.hasWriteFunction = typeof writeFunction === "function";
  
      // Inherit from 'subscribable'
      if (!ko.utils.canSetPrototype) {
          // 'subscribable' won't be on the prototype chain unless we put it there directly
          ko.utils.extend(computedObservable, ko.subscribable['fn']);
      }
      ko.subscribable['fn'].init(computedObservable);
  
      // Inherit from 'computed'
      ko.utils.setPrototypeOfOrExtend(computedObservable, computedFn);
  
      if (options['pure']) {
          state.pure = true;
          state.isSleeping = true;     // Starts off sleeping; will awake on the first subscription
          ko.utils.extend(computedObservable, pureComputedOverrides);
      } else if (options['deferEvaluation']) {
          ko.utils.extend(computedObservable, deferEvaluationOverrides);
      }
  
      if (ko.options['deferUpdates']) {
          ko.extenders['deferred'](computedObservable, true);
      }
  
      if (DEBUG) {
          // #1731 - Aid debugging by exposing the computed's options
          computedObservable["_options"] = options;
      }
  
      if (state.disposeWhenNodeIsRemoved) {
          // Since this computed is associated with a DOM node, and we don't want to dispose the computed
          // until the DOM node is *removed* from the document (as opposed to never having been in the document),
          // we'll prevent disposal until "disposeWhen" first returns false.
          state.suppressDisposalUntilDisposeWhenReturnsFalse = true;
  
          // disposeWhenNodeIsRemoved: true can be used to opt into the "only dispose after first false result"
          // behaviour even if there's no specific node to watch. In that case, clear the option so we don't try
          // to watch for a non-node's disposal. This technique is intended for KO's internal use only and shouldn't
          // be documented or used by application code, as it's likely to change in a future version of KO.
          if (!state.disposeWhenNodeIsRemoved.nodeType) {
              state.disposeWhenNodeIsRemoved = null;
          }
      }
  
      // Evaluate, unless sleeping or deferEvaluation is true
      if (!state.isSleeping && !options['deferEvaluation']) {
          computedObservable.evaluateImmediate();
      }
  
      // Attach a DOM node disposal callback so that the computed will be proactively disposed as soon as the node is
      // removed using ko.removeNode. But skip if isActive is false (there will never be any dependencies to dispose).
      if (state.disposeWhenNodeIsRemoved && computedObservable.isActive()) {
          ko.utils.domNodeDisposal.addDisposeCallback(state.disposeWhenNodeIsRemoved, state.domNodeDisposalCallback = function () {
              computedObservable.dispose();
          });
      }
  
      return computedObservable;
  };
  
  // Utility function that disposes a given dependencyTracking entry
  function computedDisposeDependencyCallback(id, entryToDispose) {
      if (entryToDispose !== null && entryToDispose.dispose) {
          entryToDispose.dispose();
      }
  }
  
  // This function gets called each time a dependency is detected while evaluating a computed.
  // It's factored out as a shared function to avoid creating unnecessary function instances during evaluation.
  function computedBeginDependencyDetectionCallback(subscribable, id) {
      var computedObservable = this.computedObservable,
          state = computedObservable[computedState];
      if (!state.isDisposed) {
          if (this.disposalCount && this.disposalCandidates[id]) {
              // Don't want to dispose this subscription, as it's still being used
              computedObservable.addDependencyTracking(id, subscribable, this.disposalCandidates[id]);
              this.disposalCandidates[id] = null; // No need to actually delete the property - disposalCandidates is a transient object anyway
              --this.disposalCount;
          } else if (!state.dependencyTracking[id]) {
              // Brand new subscription - add it
              computedObservable.addDependencyTracking(id, subscribable, state.isSleeping ? { _target: subscribable } : computedObservable.subscribeToDependency(subscribable));
          }
          // If the observable we've accessed has a pending notification, ensure we get notified of the actual final value (bypass equality checks)
          if (subscribable._notificationIsPending) {
              subscribable._notifyNextChangeIfValueIsDifferent();
          }
      }
  }
  
  var computedFn = {
      "equalityComparer": valuesArePrimitiveAndEqual,
      getDependenciesCount: function () {
          return this[computedState].dependenciesCount;
      },
      addDependencyTracking: function (id, target, trackingObj) {
          if (this[computedState].pure && target === this) {
              throw Error("A 'pure' computed must not be called recursively");
          }
  
          this[computedState].dependencyTracking[id] = trackingObj;
          trackingObj._order = this[computedState].dependenciesCount++;
          trackingObj._version = target.getVersion();
      },
      haveDependenciesChanged: function () {
          var id, dependency, dependencyTracking = this[computedState].dependencyTracking;
          for (id in dependencyTracking) {
              if (dependencyTracking.hasOwnProperty(id)) {
                  dependency = dependencyTracking[id];
                  if ((this._evalDelayed && dependency._target._notificationIsPending) || dependency._target.hasChanged(dependency._version)) {
                      return true;
                  }
              }
          }
      },
      markDirty: function () {
          // Process "dirty" events if we can handle delayed notifications
          if (this._evalDelayed && !this[computedState].isBeingEvaluated) {
              this._evalDelayed(false /*isChange*/);
          }
      },
      isActive: function () {
          var state = this[computedState];
          return state.isDirty || state.dependenciesCount > 0;
      },
      respondToChange: function () {
          // Ignore "change" events if we've already scheduled a delayed notification
          if (!this._notificationIsPending) {
              this.evaluatePossiblyAsync();
          } else if (this[computedState].isDirty) {
              this[computedState].isStale = true;
          }
      },
      subscribeToDependency: function (target) {
          if (target._deferUpdates && !this[computedState].disposeWhenNodeIsRemoved) {
              var dirtySub = target.subscribe(this.markDirty, this, 'dirty'),
                  changeSub = target.subscribe(this.respondToChange, this);
              return {
                  _target: target,
                  dispose: function () {
                      dirtySub.dispose();
                      changeSub.dispose();
                  }
              };
          } else {
              return target.subscribe(this.evaluatePossiblyAsync, this);
          }
      },
      evaluatePossiblyAsync: function () {
          var computedObservable = this,
              throttleEvaluationTimeout = computedObservable['throttleEvaluation'];
          if (throttleEvaluationTimeout && throttleEvaluationTimeout >= 0) {
              clearTimeout(this[computedState].evaluationTimeoutInstance);
              this[computedState].evaluationTimeoutInstance = ko.utils.setTimeout(function () {
                  computedObservable.evaluateImmediate(true /*notifyChange*/);
              }, throttleEvaluationTimeout);
          } else if (computedObservable._evalDelayed) {
              computedObservable._evalDelayed(true /*isChange*/);
          } else {
              computedObservable.evaluateImmediate(true /*notifyChange*/);
          }
      },
      evaluateImmediate: function (notifyChange) {
          var computedObservable = this,
              state = computedObservable[computedState],
              disposeWhen = state.disposeWhen,
              changed = false;
  
          if (state.isBeingEvaluated) {
              // If the evaluation of a ko.computed causes side effects, it's possible that it will trigger its own re-evaluation.
              // This is not desirable (it's hard for a developer to realise a chain of dependencies might cause this, and they almost
              // certainly didn't intend infinite re-evaluations). So, for predictability, we simply prevent ko.computeds from causing
              // their own re-evaluation. Further discussion at https://github.com/SteveSanderson/knockout/pull/387
              return;
          }
  
          // Do not evaluate (and possibly capture new dependencies) if disposed
          if (state.isDisposed) {
              return;
          }
  
          if (state.disposeWhenNodeIsRemoved && !ko.utils.domNodeIsAttachedToDocument(state.disposeWhenNodeIsRemoved) || disposeWhen && disposeWhen()) {
              // See comment above about suppressDisposalUntilDisposeWhenReturnsFalse
              if (!state.suppressDisposalUntilDisposeWhenReturnsFalse) {
                  computedObservable.dispose();
                  return;
              }
          } else {
              // It just did return false, so we can stop suppressing now
              state.suppressDisposalUntilDisposeWhenReturnsFalse = false;
          }
  
          state.isBeingEvaluated = true;
          try {
              changed = this.evaluateImmediate_CallReadWithDependencyDetection(notifyChange);
          } finally {
              state.isBeingEvaluated = false;
          }
  
          if (!state.dependenciesCount) {
              computedObservable.dispose();
          }
  
          return changed;
      },
      evaluateImmediate_CallReadWithDependencyDetection: function (notifyChange) {
          // This function is really just part of the evaluateImmediate logic. You would never call it from anywhere else.
          // Factoring it out into a separate function means it can be independent of the try/catch block in evaluateImmediate,
          // which contributes to saving about 40% off the CPU overhead of computed evaluation (on V8 at least).
  
          var computedObservable = this,
              state = computedObservable[computedState],
              changed = false;
  
          // Initially, we assume that none of the subscriptions are still being used (i.e., all are candidates for disposal).
          // Then, during evaluation, we cross off any that are in fact still being used.
          var isInitial = state.pure ? undefined : !state.dependenciesCount,   // If we're evaluating when there are no previous dependencies, it must be the first time
              dependencyDetectionContext = {
                  computedObservable: computedObservable,
                  disposalCandidates: state.dependencyTracking,
                  disposalCount: state.dependenciesCount
              };
  
          ko.dependencyDetection.begin({
              callbackTarget: dependencyDetectionContext,
              callback: computedBeginDependencyDetectionCallback,
              computed: computedObservable,
              isInitial: isInitial
          });
  
          state.dependencyTracking = {};
          state.dependenciesCount = 0;
  
          var newValue = this.evaluateImmediate_CallReadThenEndDependencyDetection(state, dependencyDetectionContext);
  
          if (computedObservable.isDifferent(state.latestValue, newValue)) {
              if (!state.isSleeping) {
                  computedObservable["notifySubscribers"](state.latestValue, "beforeChange");
              }
  
              state.latestValue = newValue;
              if (DEBUG) computedObservable._latestValue = newValue;
  
              if (state.isSleeping) {
                  computedObservable.updateVersion();
              } else if (notifyChange) {
                  computedObservable["notifySubscribers"](state.latestValue);
              }
  
              changed = true;
          }
  
          if (isInitial) {
              computedObservable["notifySubscribers"](state.latestValue, "awake");
          }
  
          return changed;
      },
      evaluateImmediate_CallReadThenEndDependencyDetection: function (state, dependencyDetectionContext) {
          // This function is really part of the evaluateImmediate_CallReadWithDependencyDetection logic.
          // You'd never call it from anywhere else. Factoring it out means that evaluateImmediate_CallReadWithDependencyDetection
          // can be independent of try/finally blocks, which contributes to saving about 40% off the CPU
          // overhead of computed evaluation (on V8 at least).
  
          try {
              var readFunction = state.readFunction;
              return state.evaluatorFunctionTarget ? readFunction.call(state.evaluatorFunctionTarget) : readFunction();
          } finally {
              ko.dependencyDetection.end();
  
              // For each subscription no longer being used, remove it from the active subscriptions list and dispose it
              if (dependencyDetectionContext.disposalCount && !state.isSleeping) {
                  ko.utils.objectForEach(dependencyDetectionContext.disposalCandidates, computedDisposeDependencyCallback);
              }
  
              state.isStale = state.isDirty = false;
          }
      },
      peek: function (evaluate) {
          // By default, peek won't re-evaluate, except while the computed is sleeping or to get the initial value when "deferEvaluation" is set.
          // Pass in true to evaluate if needed.
          var state = this[computedState];
          if ((state.isDirty && (evaluate || !state.dependenciesCount)) || (state.isSleeping && this.haveDependenciesChanged())) {
              this.evaluateImmediate();
          }
          return state.latestValue;
      },
      limit: function (limitFunction) {
          // Override the limit function with one that delays evaluation as well
          ko.subscribable['fn'].limit.call(this, limitFunction);
          this._evalIfChanged = function () {
              if (this[computedState].isStale) {
                  this.evaluateImmediate();
              } else {
                  this[computedState].isDirty = false;
              }
              return this[computedState].latestValue;
          };
          this._evalDelayed = function (isChange) {
              this._limitBeforeChange(this[computedState].latestValue);
  
              // Mark as dirty
              this[computedState].isDirty = true;
              if (isChange) {
                  this[computedState].isStale = true;
              }
  
              // Pass the observable to the "limit" code, which will evaluate it when
              // it's time to do the notification.
              this._limitChange(this);
          };
      },
      dispose: function () {
          var state = this[computedState];
          if (!state.isSleeping && state.dependencyTracking) {
              ko.utils.objectForEach(state.dependencyTracking, function (id, dependency) {
                  if (dependency.dispose)
                      dependency.dispose();
              });
          }
          if (state.disposeWhenNodeIsRemoved && state.domNodeDisposalCallback) {
              ko.utils.domNodeDisposal.removeDisposeCallback(state.disposeWhenNodeIsRemoved, state.domNodeDisposalCallback);
          }
          state.dependencyTracking = null;
          state.dependenciesCount = 0;
          state.isDisposed = true;
          state.isStale = false;
          state.isDirty = false;
          state.isSleeping = false;
          state.disposeWhenNodeIsRemoved = null;
      }
  };
  
  var pureComputedOverrides = {
      beforeSubscriptionAdd: function (event) {
          // If asleep, wake up the computed by subscribing to any dependencies.
          var computedObservable = this,
              state = computedObservable[computedState];
          if (!state.isDisposed && state.isSleeping && event == 'change') {
              state.isSleeping = false;
              if (state.isStale || computedObservable.haveDependenciesChanged()) {
                  state.dependencyTracking = null;
                  state.dependenciesCount = 0;
                  if (computedObservable.evaluateImmediate()) {
                      computedObservable.updateVersion();
                  }
              } else {
                  // First put the dependencies in order
                  var dependeciesOrder = [];
                  ko.utils.objectForEach(state.dependencyTracking, function (id, dependency) {
                      dependeciesOrder[dependency._order] = id;
                  });
                  // Next, subscribe to each one
                  ko.utils.arrayForEach(dependeciesOrder, function (id, order) {
                      var dependency = state.dependencyTracking[id],
                          subscription = computedObservable.subscribeToDependency(dependency._target);
                      subscription._order = order;
                      subscription._version = dependency._version;
                      state.dependencyTracking[id] = subscription;
                  });
              }
              if (!state.isDisposed) {     // test since evaluating could trigger disposal
                  computedObservable["notifySubscribers"](state.latestValue, "awake");
              }
          }
      },
      afterSubscriptionRemove: function (event) {
          var state = this[computedState];
          if (!state.isDisposed && event == 'change' && !this.hasSubscriptionsForEvent('change')) {
              ko.utils.objectForEach(state.dependencyTracking, function (id, dependency) {
                  if (dependency.dispose) {
                      state.dependencyTracking[id] = {
                          _target: dependency._target,
                          _order: dependency._order,
                          _version: dependency._version
                      };
                      dependency.dispose();
                  }
              });
              state.isSleeping = true;
              this["notifySubscribers"](undefined, "asleep");
          }
      },
      getVersion: function () {
          // Because a pure computed is not automatically updated while it is sleeping, we can't
          // simply return the version number. Instead, we check if any of the dependencies have
          // changed and conditionally re-evaluate the computed observable.
          var state = this[computedState];
          if (state.isSleeping && (state.isStale || this.haveDependenciesChanged())) {
              this.evaluateImmediate();
          }
          return ko.subscribable['fn'].getVersion.call(this);
      }
  };
  
  var deferEvaluationOverrides = {
      beforeSubscriptionAdd: function (event) {
          // This will force a computed with deferEvaluation to evaluate when the first subscription is registered.
          if (event == 'change' || event == 'beforeChange') {
              this.peek();
          }
      }
  };
  
  // Note that for browsers that don't support proto assignment, the
  // inheritance chain is created manually in the ko.computed constructor
  if (ko.utils.canSetPrototype) {
      ko.utils.setPrototypeOf(computedFn, ko.subscribable['fn']);
  }
  
  // Set the proto chain values for ko.hasPrototype
  var protoProp = ko.observable.protoProperty; // == "__ko_proto__"
  ko.computed[protoProp] = ko.observable;
  computedFn[protoProp] = ko.computed;
  
  ko.isComputed = function (instance) {
      return ko.hasPrototype(instance, ko.computed);
  };
  
  ko.isPureComputed = function (instance) {
      return ko.hasPrototype(instance, ko.computed)
          && instance[computedState] && instance[computedState].pure;
  };
  
  ko.exportSymbol('computed', ko.computed);
  ko.exportSymbol('dependentObservable', ko.computed);    // export ko.dependentObservable for backwards compatibility (1.x)
  ko.exportSymbol('isComputed', ko.isComputed);
  ko.exportSymbol('isPureComputed', ko.isPureComputed);
  ko.exportSymbol('computed.fn', computedFn);
  ko.exportProperty(computedFn, 'peek', computedFn.peek);
  ko.exportProperty(computedFn, 'dispose', computedFn.dispose);
  ko.exportProperty(computedFn, 'isActive', computedFn.isActive);
  ko.exportProperty(computedFn, 'getDependenciesCount', computedFn.getDependenciesCount);
  
  ko.pureComputed = function (evaluatorFunctionOrOptions, evaluatorFunctionTarget) {
      if (typeof evaluatorFunctionOrOptions === 'function') {
          return ko.computed(evaluatorFunctionOrOptions, evaluatorFunctionTarget, {'pure':true});
      } else {
          evaluatorFunctionOrOptions = ko.utils.extend({}, evaluatorFunctionOrOptions);   // make a copy of the parameter object
          evaluatorFunctionOrOptions['pure'] = true;
          return ko.computed(evaluatorFunctionOrOptions, evaluatorFunctionTarget);
      }
  }
  ko.exportSymbol('pureComputed', ko.pureComputed);
  
  (function() {
      var maxNestedObservableDepth = 10; // Escape the (unlikely) pathalogical case where an observable's current value is itself (or similar reference cycle)
  
      ko.toJS = function(rootObject) {
          if (arguments.length == 0)
              throw new Error("When calling ko.toJS, pass the object you want to convert.");
  
          // We just unwrap everything at every level in the object graph
          return mapJsObjectGraph(rootObject, function(valueToMap) {
              // Loop because an observable's value might in turn be another observable wrapper
              for (var i = 0; ko.isObservable(valueToMap) && (i < maxNestedObservableDepth); i++)
                  valueToMap = valueToMap();
              return valueToMap;
          });
      };
  
      ko.toJSON = function(rootObject, replacer, space) {     // replacer and space are optional
          var plainJavaScriptObject = ko.toJS(rootObject);
          return ko.utils.stringifyJson(plainJavaScriptObject, replacer, space);
      };
  
      function mapJsObjectGraph(rootObject, mapInputCallback, visitedObjects) {
          visitedObjects = visitedObjects || new objectLookup();
  
          rootObject = mapInputCallback(rootObject);
          var canHaveProperties = (typeof rootObject == "object") && (rootObject !== null) && (rootObject !== undefined) && (!(rootObject instanceof RegExp)) && (!(rootObject instanceof Date)) && (!(rootObject instanceof String)) && (!(rootObject instanceof Number)) && (!(rootObject instanceof Boolean));
          if (!canHaveProperties)
              return rootObject;
  
          var outputProperties = rootObject instanceof Array ? [] : {};
          visitedObjects.save(rootObject, outputProperties);
  
          visitPropertiesOrArrayEntries(rootObject, function(indexer) {
              var propertyValue = mapInputCallback(rootObject[indexer]);
  
              switch (typeof propertyValue) {
                  case "boolean":
                  case "number":
                  case "string":
                  case "function":
                      outputProperties[indexer] = propertyValue;
                      break;
                  case "object":
                  case "undefined":
                      var previouslyMappedValue = visitedObjects.get(propertyValue);
                      outputProperties[indexer] = (previouslyMappedValue !== undefined)
                          ? previouslyMappedValue
                          : mapJsObjectGraph(propertyValue, mapInputCallback, visitedObjects);
                      break;
              }
          });
  
          return outputProperties;
      }
  
      function visitPropertiesOrArrayEntries(rootObject, visitorCallback) {
          if (rootObject instanceof Array) {
              for (var i = 0; i < rootObject.length; i++)
                  visitorCallback(i);
  
              // For arrays, also respect toJSON property for custom mappings (fixes #278)
              if (typeof rootObject['toJSON'] == 'function')
                  visitorCallback('toJSON');
          } else {
              for (var propertyName in rootObject) {
                  visitorCallback(propertyName);
              }
          }
      };
  
      function objectLookup() {
          this.keys = [];
          this.values = [];
      };
  
      objectLookup.prototype = {
          constructor: objectLookup,
          save: function(key, value) {
              var existingIndex = ko.utils.arrayIndexOf(this.keys, key);
              if (existingIndex >= 0)
                  this.values[existingIndex] = value;
              else {
                  this.keys.push(key);
                  this.values.push(value);
              }
          },
          get: function(key) {
              var existingIndex = ko.utils.arrayIndexOf(this.keys, key);
              return (existingIndex >= 0) ? this.values[existingIndex] : undefined;
          }
      };
  })();
  
  ko.exportSymbol('toJS', ko.toJS);
  ko.exportSymbol('toJSON', ko.toJSON);
  (function () {
      var hasDomDataExpandoProperty = '__ko__hasDomDataOptionValue__';
  
      // Normally, SELECT elements and their OPTIONs can only take value of type 'string' (because the values
      // are stored on DOM attributes). ko.selectExtensions provides a way for SELECTs/OPTIONs to have values
      // that are arbitrary objects. This is very convenient when implementing things like cascading dropdowns.
      ko.selectExtensions = {
          readValue : function(element) {
              switch (ko.utils.tagNameLower(element)) {
                  case 'option':
                      if (element[hasDomDataExpandoProperty] === true)
                          return ko.utils.domData.get(element, ko.bindingHandlers.options.optionValueDomDataKey);
                      return ko.utils.ieVersion <= 7
                          ? (element.getAttributeNode('value') && element.getAttributeNode('value').specified ? element.value : element.text)
                          : element.value;
                  case 'select':
                      return element.selectedIndex >= 0 ? ko.selectExtensions.readValue(element.options[element.selectedIndex]) : undefined;
                  default:
                      return element.value;
              }
          },
  
          writeValue: function(element, value, allowUnset) {
              switch (ko.utils.tagNameLower(element)) {
                  case 'option':
                      switch(typeof value) {
                          case "string":
                              ko.utils.domData.set(element, ko.bindingHandlers.options.optionValueDomDataKey, undefined);
                              if (hasDomDataExpandoProperty in element) { // IE <= 8 throws errors if you delete non-existent properties from a DOM node
                                  delete element[hasDomDataExpandoProperty];
                              }
                              element.value = value;
                              break;
                          default:
                              // Store arbitrary object using DomData
                              ko.utils.domData.set(element, ko.bindingHandlers.options.optionValueDomDataKey, value);
                              element[hasDomDataExpandoProperty] = true;
  
                              // Special treatment of numbers is just for backward compatibility. KO 1.2.1 wrote numerical values to element.value.
                              element.value = typeof value === "number" ? value : "";
                              break;
                      }
                      break;
                  case 'select':
                      if (value === "" || value === null)       // A blank string or null value will select the caption
                          value = undefined;
                      var selection = -1;
                      for (var i = 0, n = element.options.length, optionValue; i < n; ++i) {
                          optionValue = ko.selectExtensions.readValue(element.options[i]);
                          // Include special check to handle selecting a caption with a blank string value
                          if (optionValue == value || (optionValue == "" && value === undefined)) {
                              selection = i;
                              break;
                          }
                      }
                      if (allowUnset || selection >= 0 || (value === undefined && element.size > 1)) {
                          element.selectedIndex = selection;
                      }
                      break;
                  default:
                      if ((value === null) || (value === undefined))
                          value = "";
                      element.value = value;
                      break;
              }
          }
      };
  })();
  
  ko.exportSymbol('selectExtensions', ko.selectExtensions);
  ko.exportSymbol('selectExtensions.readValue', ko.selectExtensions.readValue);
  ko.exportSymbol('selectExtensions.writeValue', ko.selectExtensions.writeValue);
  ko.expressionRewriting = (function () {
      var javaScriptReservedWords = ["true", "false", "null", "undefined"];
  
      // Matches something that can be assigned to--either an isolated identifier or something ending with a property accessor
      // This is designed to be simple and avoid false negatives, but could produce false positives (e.g., a+b.c).
      // This also will not properly handle nested brackets (e.g., obj1[obj2['prop']]; see #911).
      var javaScriptAssignmentTarget = /^(?:[$_a-z][$\w]*|(.+)(\.\s*[$_a-z][$\w]*|\[.+\]))$/i;
  
      function getWriteableValue(expression) {
          if (ko.utils.arrayIndexOf(javaScriptReservedWords, expression) >= 0)
              return false;
          var match = expression.match(javaScriptAssignmentTarget);
          return match === null ? false : match[1] ? ('Object(' + match[1] + ')' + match[2]) : expression;
      }
  
      // The following regular expressions will be used to split an object-literal string into tokens
  
          // These two match strings, either with double quotes or single quotes
      var stringDouble = '"(?:[^"\\\\]|\\\\.)*"',
          stringSingle = "'(?:[^'\\\\]|\\\\.)*'",
          // Matches a regular expression (text enclosed by slashes), but will also match sets of divisions
          // as a regular expression (this is handled by the parsing loop below).
          stringRegexp = '/(?:[^/\\\\]|\\\\.)*/\w*',
          // These characters have special meaning to the parser and must not appear in the middle of a
          // token, except as part of a string.
          specials = ',"\'{}()/:[\\]',
          // Match text (at least two characters) that does not contain any of the above special characters,
          // although some of the special characters are allowed to start it (all but the colon and comma).
          // The text can contain spaces, but leading or trailing spaces are skipped.
          everyThingElse = '[^\\s:,/][^' + specials + ']*[^\\s' + specials + ']',
          // Match any non-space character not matched already. This will match colons and commas, since they're
          // not matched by "everyThingElse", but will also match any other single character that wasn't already
          // matched (for example: in "a: 1, b: 2", each of the non-space characters will be matched by oneNotSpace).
          oneNotSpace = '[^\\s]',
  
          // Create the actual regular expression by or-ing the above strings. The order is important.
          bindingToken = RegExp(stringDouble + '|' + stringSingle + '|' + stringRegexp + '|' + everyThingElse + '|' + oneNotSpace, 'g'),
  
          // Match end of previous token to determine whether a slash is a division or regex.
          divisionLookBehind = /[\])"'A-Za-z0-9_$]+$/,
          keywordRegexLookBehind = {'in':1,'return':1,'typeof':1};
  
      function parseObjectLiteral(objectLiteralString) {
          // Trim leading and trailing spaces from the string
          var str = ko.utils.stringTrim(objectLiteralString);
  
          // Trim braces '{' surrounding the whole object literal
          if (str.charCodeAt(0) === 123) str = str.slice(1, -1);
  
          // Split into tokens
          var result = [], toks = str.match(bindingToken), key, values = [], depth = 0;
  
          if (toks) {
              // Append a comma so that we don't need a separate code block to deal with the last item
              toks.push(',');
  
              for (var i = 0, tok; tok = toks[i]; ++i) {
                  var c = tok.charCodeAt(0);
                  // A comma signals the end of a key/value pair if depth is zero
                  if (c === 44) { // ","
                      if (depth <= 0) {
                          result.push((key && values.length) ? {key: key, value: values.join('')} : {'unknown': key || values.join('')});
                          key = depth = 0;
                          values = [];
                          continue;
                      }
                  // Simply skip the colon that separates the name and value
                  } else if (c === 58) { // ":"
                      if (!depth && !key && values.length === 1) {
                          key = values.pop();
                          continue;
                      }
                  // A set of slashes is initially matched as a regular expression, but could be division
                  } else if (c === 47 && i && tok.length > 1) {  // "/"
                      // Look at the end of the previous token to determine if the slash is actually division
                      var match = toks[i-1].match(divisionLookBehind);
                      if (match && !keywordRegexLookBehind[match[0]]) {
                          // The slash is actually a division punctuator; re-parse the remainder of the string (not including the slash)
                          str = str.substr(str.indexOf(tok) + 1);
                          toks = str.match(bindingToken);
                          toks.push(',');
                          i = -1;
                          // Continue with just the slash
                          tok = '/';
                      }
                  // Increment depth for parentheses, braces, and brackets so that interior commas are ignored
                  } else if (c === 40 || c === 123 || c === 91) { // '(', '{', '['
                      ++depth;
                  } else if (c === 41 || c === 125 || c === 93) { // ')', '}', ']'
                      --depth;
                  // The key will be the first token; if it's a string, trim the quotes
                  } else if (!key && !values.length && (c === 34 || c === 39)) { // '"', "'"
                      tok = tok.slice(1, -1);
                  }
                  values.push(tok);
              }
          }
          return result;
      }
  
      // Two-way bindings include a write function that allow the handler to update the value even if it's not an observable.
      var twoWayBindings = {};
  
      function preProcessBindings(bindingsStringOrKeyValueArray, bindingOptions) {
          bindingOptions = bindingOptions || {};
  
          function processKeyValue(key, val) {
              var writableVal;
              function callPreprocessHook(obj) {
                  return (obj && obj['preprocess']) ? (val = obj['preprocess'](val, key, processKeyValue)) : true;
              }
              if (!bindingParams) {
                  if (!callPreprocessHook(ko['getBindingHandler'](key)))
                      return;
  
                  if (twoWayBindings[key] && (writableVal = getWriteableValue(val))) {
                      // For two-way bindings, provide a write method in case the value
                      // isn't a writable observable.
                      propertyAccessorResultStrings.push("'" + key + "':function(_z){" + writableVal + "=_z}");
                  }
              }
              // Values are wrapped in a function so that each value can be accessed independently
              if (makeValueAccessors) {
                  val = 'function(){return ' + val + ' }';
              }
              resultStrings.push("'" + key + "':" + val);
          }
  
          var resultStrings = [],
              propertyAccessorResultStrings = [],
              makeValueAccessors = bindingOptions['valueAccessors'],
              bindingParams = bindingOptions['bindingParams'],
              keyValueArray = typeof bindingsStringOrKeyValueArray === "string" ?
                  parseObjectLiteral(bindingsStringOrKeyValueArray) : bindingsStringOrKeyValueArray;
  
          ko.utils.arrayForEach(keyValueArray, function(keyValue) {
              processKeyValue(keyValue.key || keyValue['unknown'], keyValue.value);
          });
  
          if (propertyAccessorResultStrings.length)
              processKeyValue('_ko_property_writers', "{" + propertyAccessorResultStrings.join(",") + " }");
  
          return resultStrings.join(",");
      }
  
      return {
          bindingRewriteValidators: [],
  
          twoWayBindings: twoWayBindings,
  
          parseObjectLiteral: parseObjectLiteral,
  
          preProcessBindings: preProcessBindings,
  
          keyValueArrayContainsKey: function(keyValueArray, key) {
              for (var i = 0; i < keyValueArray.length; i++)
                  if (keyValueArray[i]['key'] == key)
                      return true;
              return false;
          },
  
          // Internal, private KO utility for updating model properties from within bindings
          // property:            If the property being updated is (or might be) an observable, pass it here
          //                      If it turns out to be a writable observable, it will be written to directly
          // allBindings:         An object with a get method to retrieve bindings in the current execution context.
          //                      This will be searched for a '_ko_property_writers' property in case you're writing to a non-observable
          // key:                 The key identifying the property to be written. Example: for { hasFocus: myValue }, write to 'myValue' by specifying the key 'hasFocus'
          // value:               The value to be written
          // checkIfDifferent:    If true, and if the property being written is a writable observable, the value will only be written if
          //                      it is !== existing value on that writable observable
          writeValueToProperty: function(property, allBindings, key, value, checkIfDifferent) {
              if (!property || !ko.isObservable(property)) {
                  var propWriters = allBindings.get('_ko_property_writers');
                  if (propWriters && propWriters[key])
                      propWriters[key](value);
              } else if (ko.isWriteableObservable(property) && (!checkIfDifferent || property.peek() !== value)) {
                  property(value);
              }
          }
      };
  })();
  
  ko.exportSymbol('expressionRewriting', ko.expressionRewriting);
  ko.exportSymbol('expressionRewriting.bindingRewriteValidators', ko.expressionRewriting.bindingRewriteValidators);
  ko.exportSymbol('expressionRewriting.parseObjectLiteral', ko.expressionRewriting.parseObjectLiteral);
  ko.exportSymbol('expressionRewriting.preProcessBindings', ko.expressionRewriting.preProcessBindings);
  
  // Making bindings explicitly declare themselves as "two way" isn't ideal in the long term (it would be better if
  // all bindings could use an official 'property writer' API without needing to declare that they might). However,
  // since this is not, and has never been, a public API (_ko_property_writers was never documented), it's acceptable
  // as an internal implementation detail in the short term.
  // For those developers who rely on _ko_property_writers in their custom bindings, we expose _twoWayBindings as an
  // undocumented feature that makes it relatively easy to upgrade to KO 3.0. However, this is still not an official
  // public API, and we reserve the right to remove it at any time if we create a real public property writers API.
  ko.exportSymbol('expressionRewriting._twoWayBindings', ko.expressionRewriting.twoWayBindings);
  
  // For backward compatibility, define the following aliases. (Previously, these function names were misleading because
  // they referred to JSON specifically, even though they actually work with arbitrary JavaScript object literal expressions.)
  ko.exportSymbol('jsonExpressionRewriting', ko.expressionRewriting);
  ko.exportSymbol('jsonExpressionRewriting.insertPropertyAccessorsIntoJson', ko.expressionRewriting.preProcessBindings);
  (function() {
      // "Virtual elements" is an abstraction on top of the usual DOM API which understands the notion that comment nodes
      // may be used to represent hierarchy (in addition to the DOM's natural hierarchy).
      // If you call the DOM-manipulating functions on ko.virtualElements, you will be able to read and write the state
      // of that virtual hierarchy
      //
      // The point of all this is to support containerless templates (e.g., <!-- ko foreach:someCollection -->blah<!-- /ko -->)
      // without having to scatter special cases all over the binding and templating code.
  
      // IE 9 cannot reliably read the "nodeValue" property of a comment node (see https://github.com/SteveSanderson/knockout/issues/186)
      // but it does give them a nonstandard alternative property called "text" that it can read reliably. Other browsers don't have that property.
      // So, use node.text where available, and node.nodeValue elsewhere
      var commentNodesHaveTextProperty = document && document.createComment("test").text === "<!--test-->";
  
      var startCommentRegex = commentNodesHaveTextProperty ? /^<!--\s*ko(?:\s+([\s\S]+))?\s*-->$/ : /^\s*ko(?:\s+([\s\S]+))?\s*$/;
      var endCommentRegex =   commentNodesHaveTextProperty ? /^<!--\s*\/ko\s*-->$/ : /^\s*\/ko\s*$/;
      var htmlTagsWithOptionallyClosingChildren = { 'ul': true, 'ol': true };
  
      function isStartComment(node) {
          return (node.nodeType == 8) && startCommentRegex.test(commentNodesHaveTextProperty ? node.text : node.nodeValue);
      }
  
      function isEndComment(node) {
          return (node.nodeType == 8) && endCommentRegex.test(commentNodesHaveTextProperty ? node.text : node.nodeValue);
      }
  
      function getVirtualChildren(startComment, allowUnbalanced) {
          var currentNode = startComment;
          var depth = 1;
          var children = [];
          while (currentNode = currentNode.nextSibling) {
              if (isEndComment(currentNode)) {
                  depth--;
                  if (depth === 0)
                      return children;
              }
  
              children.push(currentNode);
  
              if (isStartComment(currentNode))
                  depth++;
          }
          if (!allowUnbalanced)
              throw new Error("Cannot find closing comment tag to match: " + startComment.nodeValue);
          return null;
      }
  
      function getMatchingEndComment(startComment, allowUnbalanced) {
          var allVirtualChildren = getVirtualChildren(startComment, allowUnbalanced);
          if (allVirtualChildren) {
              if (allVirtualChildren.length > 0)
                  return allVirtualChildren[allVirtualChildren.length - 1].nextSibling;
              return startComment.nextSibling;
          } else
              return null; // Must have no matching end comment, and allowUnbalanced is true
      }
  
      function getUnbalancedChildTags(node) {
          // e.g., from <div>OK</div><!-- ko blah --><span>Another</span>, returns: <!-- ko blah --><span>Another</span>
          //       from <div>OK</div><!-- /ko --><!-- /ko -->,             returns: <!-- /ko --><!-- /ko -->
          var childNode = node.firstChild, captureRemaining = null;
          if (childNode) {
              do {
                  if (captureRemaining)                   // We already hit an unbalanced node and are now just scooping up all subsequent nodes
                      captureRemaining.push(childNode);
                  else if (isStartComment(childNode)) {
                      var matchingEndComment = getMatchingEndComment(childNode, /* allowUnbalanced: */ true);
                      if (matchingEndComment)             // It's a balanced tag, so skip immediately to the end of this virtual set
                          childNode = matchingEndComment;
                      else
                          captureRemaining = [childNode]; // It's unbalanced, so start capturing from this point
                  } else if (isEndComment(childNode)) {
                      captureRemaining = [childNode];     // It's unbalanced (if it wasn't, we'd have skipped over it already), so start capturing
                  }
              } while (childNode = childNode.nextSibling);
          }
          return captureRemaining;
      }
  
      ko.virtualElements = {
          allowedBindings: {},
  
          childNodes: function(node) {
              return isStartComment(node) ? getVirtualChildren(node) : node.childNodes;
          },
  
          emptyNode: function(node) {
              if (!isStartComment(node))
                  ko.utils.emptyDomNode(node);
              else {
                  var virtualChildren = ko.virtualElements.childNodes(node);
                  for (var i = 0, j = virtualChildren.length; i < j; i++)
                      ko.removeNode(virtualChildren[i]);
              }
          },
  
          setDomNodeChildren: function(node, childNodes) {
              if (!isStartComment(node))
                  ko.utils.setDomNodeChildren(node, childNodes);
              else {
                  ko.virtualElements.emptyNode(node);
                  var endCommentNode = node.nextSibling; // Must be the next sibling, as we just emptied the children
                  for (var i = 0, j = childNodes.length; i < j; i++)
                      endCommentNode.parentNode.insertBefore(childNodes[i], endCommentNode);
              }
          },
  
          prepend: function(containerNode, nodeToPrepend) {
              if (!isStartComment(containerNode)) {
                  if (containerNode.firstChild)
                      containerNode.insertBefore(nodeToPrepend, containerNode.firstChild);
                  else
                      containerNode.appendChild(nodeToPrepend);
              } else {
                  // Start comments must always have a parent and at least one following sibling (the end comment)
                  containerNode.parentNode.insertBefore(nodeToPrepend, containerNode.nextSibling);
              }
          },
  
          insertAfter: function(containerNode, nodeToInsert, insertAfterNode) {
              if (!insertAfterNode) {
                  ko.virtualElements.prepend(containerNode, nodeToInsert);
              } else if (!isStartComment(containerNode)) {
                  // Insert after insertion point
                  if (insertAfterNode.nextSibling)
                      containerNode.insertBefore(nodeToInsert, insertAfterNode.nextSibling);
                  else
                      containerNode.appendChild(nodeToInsert);
              } else {
                  // Children of start comments must always have a parent and at least one following sibling (the end comment)
                  containerNode.parentNode.insertBefore(nodeToInsert, insertAfterNode.nextSibling);
              }
          },
  
          firstChild: function(node) {
              if (!isStartComment(node))
                  return node.firstChild;
              if (!node.nextSibling || isEndComment(node.nextSibling))
                  return null;
              return node.nextSibling;
          },
  
          nextSibling: function(node) {
              if (isStartComment(node))
                  node = getMatchingEndComment(node);
              if (node.nextSibling && isEndComment(node.nextSibling))
                  return null;
              return node.nextSibling;
          },
  
          hasBindingValue: isStartComment,
  
          virtualNodeBindingValue: function(node) {
              var regexMatch = (commentNodesHaveTextProperty ? node.text : node.nodeValue).match(startCommentRegex);
              return regexMatch ? regexMatch[1] : null;
          },
  
          normaliseVirtualElementDomStructure: function(elementVerified) {
              // Workaround for https://github.com/SteveSanderson/knockout/issues/155
              // (IE <= 8 or IE 9 quirks mode parses your HTML weirdly, treating closing </li> tags as if they don't exist, thereby moving comment nodes
              // that are direct descendants of <ul> into the preceding <li>)
              if (!htmlTagsWithOptionallyClosingChildren[ko.utils.tagNameLower(elementVerified)])
                  return;
  
              // Scan immediate children to see if they contain unbalanced comment tags. If they do, those comment tags
              // must be intended to appear *after* that child, so move them there.
              var childNode = elementVerified.firstChild;
              if (childNode) {
                  do {
                      if (childNode.nodeType === 1) {
                          var unbalancedTags = getUnbalancedChildTags(childNode);
                          if (unbalancedTags) {
                              // Fix up the DOM by moving the unbalanced tags to where they most likely were intended to be placed - *after* the child
                              var nodeToInsertBefore = childNode.nextSibling;
                              for (var i = 0; i < unbalancedTags.length; i++) {
                                  if (nodeToInsertBefore)
                                      elementVerified.insertBefore(unbalancedTags[i], nodeToInsertBefore);
                                  else
                                      elementVerified.appendChild(unbalancedTags[i]);
                              }
                          }
                      }
                  } while (childNode = childNode.nextSibling);
              }
          }
      };
  })();
  ko.exportSymbol('virtualElements', ko.virtualElements);
  ko.exportSymbol('virtualElements.allowedBindings', ko.virtualElements.allowedBindings);
  ko.exportSymbol('virtualElements.emptyNode', ko.virtualElements.emptyNode);
  //ko.exportSymbol('virtualElements.firstChild', ko.virtualElements.firstChild);     // firstChild is not minified
  ko.exportSymbol('virtualElements.insertAfter', ko.virtualElements.insertAfter);
  //ko.exportSymbol('virtualElements.nextSibling', ko.virtualElements.nextSibling);   // nextSibling is not minified
  ko.exportSymbol('virtualElements.prepend', ko.virtualElements.prepend);
  ko.exportSymbol('virtualElements.setDomNodeChildren', ko.virtualElements.setDomNodeChildren);
  (function() {
      var defaultBindingAttributeName = "data-bind";
  
      ko.bindingProvider = function() {
          this.bindingCache = {};
      };
  
      ko.utils.extend(ko.bindingProvider.prototype, {
          'nodeHasBindings': function(node) {
              switch (node.nodeType) {
                  case 1: // Element
                      return node.getAttribute(defaultBindingAttributeName) != null
                          || ko.components['getComponentNameForNode'](node);
                  case 8: // Comment node
                      return ko.virtualElements.hasBindingValue(node);
                  default: return false;
              }
          },
  
          'getBindings': function(node, bindingContext) {
              var bindingsString = this['getBindingsString'](node, bindingContext),
                  parsedBindings = bindingsString ? this['parseBindingsString'](bindingsString, bindingContext, node) : null;
              return ko.components.addBindingsForCustomElement(parsedBindings, node, bindingContext, /* valueAccessors */ false);
          },
  
          'getBindingAccessors': function(node, bindingContext) {
              var bindingsString = this['getBindingsString'](node, bindingContext),
                  parsedBindings = bindingsString ? this['parseBindingsString'](bindingsString, bindingContext, node, { 'valueAccessors': true }) : null;
              return ko.components.addBindingsForCustomElement(parsedBindings, node, bindingContext, /* valueAccessors */ true);
          },
  
          // The following function is only used internally by this default provider.
          // It's not part of the interface definition for a general binding provider.
          'getBindingsString': function(node, bindingContext) {
              switch (node.nodeType) {
                  case 1: return node.getAttribute(defaultBindingAttributeName);   // Element
                  case 8: return ko.virtualElements.virtualNodeBindingValue(node); // Comment node
                  default: return null;
              }
          },
  
          // The following function is only used internally by this default provider.
          // It's not part of the interface definition for a general binding provider.
          'parseBindingsString': function(bindingsString, bindingContext, node, options) {
              try {
                  var bindingFunction = createBindingsStringEvaluatorViaCache(bindingsString, this.bindingCache, options);
                  return bindingFunction(bindingContext, node);
              } catch (ex) {
                  ex.message = "Unable to parse bindings.\nBindings value: " + bindingsString + "\nMessage: " + ex.message;
                  throw ex;
              }
          }
      });
  
      ko.bindingProvider['instance'] = new ko.bindingProvider();
  
      function createBindingsStringEvaluatorViaCache(bindingsString, cache, options) {
          var cacheKey = bindingsString + (options && options['valueAccessors'] || '');
          return cache[cacheKey]
              || (cache[cacheKey] = createBindingsStringEvaluator(bindingsString, options));
      }
  
      function createBindingsStringEvaluator(bindingsString, options) {
          // Build the source for a function that evaluates "expression"
          // For each scope variable, add an extra level of "with" nesting
          // Example result: with(sc1) { with(sc0) { return (expression) } }
          var rewrittenBindings = ko.expressionRewriting.preProcessBindings(bindingsString, options),
              functionBody = "with($context){with($data||{}){return{" + rewrittenBindings + "}}}";
          return new Function("$context", "$element", functionBody);
      }
  })();
  
  ko.exportSymbol('bindingProvider', ko.bindingProvider);
  (function () {
      ko.bindingHandlers = {};
  
      // The following element types will not be recursed into during binding.
      var bindingDoesNotRecurseIntoElementTypes = {
          // Don't want bindings that operate on text nodes to mutate <script> and <textarea> contents,
          // because it's unexpected and a potential XSS issue.
          // Also bindings should not operate on <template> elements since this breaks in Internet Explorer
          // and because such elements' contents are always intended to be bound in a different context
          // from where they appear in the document.
          'script': true,
          'textarea': true,
          'template': true
      };
  
      // Use an overridable method for retrieving binding handlers so that a plugins may support dynamically created handlers
      ko['getBindingHandler'] = function(bindingKey) {
          return ko.bindingHandlers[bindingKey];
      };
  
      // The ko.bindingContext constructor is only called directly to create the root context. For child
      // contexts, use bindingContext.createChildContext or bindingContext.extend.
      ko.bindingContext = function(dataItemOrAccessor, parentContext, dataItemAlias, extendCallback, options) {
  
          // The binding context object includes static properties for the current, parent, and root view models.
          // If a view model is actually stored in an observable, the corresponding binding context object, and
          // any child contexts, must be updated when the view model is changed.
          function updateContext() {
              // Most of the time, the context will directly get a view model object, but if a function is given,
              // we call the function to retrieve the view model. If the function accesses any observables or returns
              // an observable, the dependency is tracked, and those observables can later cause the binding
              // context to be updated.
              var dataItemOrObservable = isFunc ? dataItemOrAccessor() : dataItemOrAccessor,
                  dataItem = ko.utils.unwrapObservable(dataItemOrObservable);
  
              if (parentContext) {
                  // When a "parent" context is given, register a dependency on the parent context. Thus whenever the
                  // parent context is updated, this context will also be updated.
                  if (parentContext._subscribable)
                      parentContext._subscribable();
  
                  // Copy $root and any custom properties from the parent context
                  ko.utils.extend(self, parentContext);
  
                  // Because the above copy overwrites our own properties, we need to reset them.
                  self._subscribable = subscribable;
              } else {
                  self['$parents'] = [];
                  self['$root'] = dataItem;
  
                  // Export 'ko' in the binding context so it will be available in bindings and templates
                  // even if 'ko' isn't exported as a global, such as when using an AMD loader.
                  // See https://github.com/SteveSanderson/knockout/issues/490
                  self['ko'] = ko;
              }
              self['$rawData'] = dataItemOrObservable;
              self['$data'] = dataItem;
              if (dataItemAlias)
                  self[dataItemAlias] = dataItem;
  
              // The extendCallback function is provided when creating a child context or extending a context.
              // It handles the specific actions needed to finish setting up the binding context. Actions in this
              // function could also add dependencies to this binding context.
              if (extendCallback)
                  extendCallback(self, parentContext, dataItem);
  
              return self['$data'];
          }
          function disposeWhen() {
              return nodes && !ko.utils.anyDomNodeIsAttachedToDocument(nodes);
          }
  
          var self = this,
              isFunc = typeof(dataItemOrAccessor) == "function" && !ko.isObservable(dataItemOrAccessor),
              nodes,
              subscribable;
  
          if (options && options['exportDependencies']) {
              // The "exportDependencies" option means that the calling code will track any dependencies and re-create
              // the binding context when they change.
              updateContext();
          } else {
              subscribable = ko.dependentObservable(updateContext, null, { disposeWhen: disposeWhen, disposeWhenNodeIsRemoved: true });
  
              // At this point, the binding context has been initialized, and the "subscribable" computed observable is
              // subscribed to any observables that were accessed in the process. If there is nothing to track, the
              // computed will be inactive, and we can safely throw it away. If it's active, the computed is stored in
              // the context object.
              if (subscribable.isActive()) {
                  self._subscribable = subscribable;
  
                  // Always notify because even if the model ($data) hasn't changed, other context properties might have changed
                  subscribable['equalityComparer'] = null;
  
                  // We need to be able to dispose of this computed observable when it's no longer needed. This would be
                  // easy if we had a single node to watch, but binding contexts can be used by many different nodes, and
                  // we cannot assume that those nodes have any relation to each other. So instead we track any node that
                  // the context is attached to, and dispose the computed when all of those nodes have been cleaned.
  
                  // Add properties to *subscribable* instead of *self* because any properties added to *self* may be overwritten on updates
                  nodes = [];
                  subscribable._addNode = function(node) {
                      nodes.push(node);
                      ko.utils.domNodeDisposal.addDisposeCallback(node, function(node) {
                          ko.utils.arrayRemoveItem(nodes, node);
                          if (!nodes.length) {
                              subscribable.dispose();
                              self._subscribable = subscribable = undefined;
                          }
                      });
                  };
              }
          }
      }
  
      // Extend the binding context hierarchy with a new view model object. If the parent context is watching
      // any observables, the new child context will automatically get a dependency on the parent context.
      // But this does not mean that the $data value of the child context will also get updated. If the child
      // view model also depends on the parent view model, you must provide a function that returns the correct
      // view model on each update.
      ko.bindingContext.prototype['createChildContext'] = function (dataItemOrAccessor, dataItemAlias, extendCallback, options) {
          return new ko.bindingContext(dataItemOrAccessor, this, dataItemAlias, function(self, parentContext) {
              // Extend the context hierarchy by setting the appropriate pointers
              self['$parentContext'] = parentContext;
              self['$parent'] = parentContext['$data'];
              self['$parents'] = (parentContext['$parents'] || []).slice(0);
              self['$parents'].unshift(self['$parent']);
              if (extendCallback)
                  extendCallback(self);
          }, options);
      };
  
      // Extend the binding context with new custom properties. This doesn't change the context hierarchy.
      // Similarly to "child" contexts, provide a function here to make sure that the correct values are set
      // when an observable view model is updated.
      ko.bindingContext.prototype['extend'] = function(properties) {
          // If the parent context references an observable view model, "_subscribable" will always be the
          // latest view model object. If not, "_subscribable" isn't set, and we can use the static "$data" value.
          return new ko.bindingContext(this._subscribable || this['$data'], this, null, function(self, parentContext) {
              // This "child" context doesn't directly track a parent observable view model,
              // so we need to manually set the $rawData value to match the parent.
              self['$rawData'] = parentContext['$rawData'];
              ko.utils.extend(self, typeof(properties) == "function" ? properties() : properties);
          });
      };
  
      ko.bindingContext.prototype.createStaticChildContext = function (dataItemOrAccessor, dataItemAlias) {
          return this['createChildContext'](dataItemOrAccessor, dataItemAlias, null, { "exportDependencies": true });
      };
  
      // Returns the valueAccesor function for a binding value
      function makeValueAccessor(value) {
          return function() {
              return value;
          };
      }
  
      // Returns the value of a valueAccessor function
      function evaluateValueAccessor(valueAccessor) {
          return valueAccessor();
      }
  
      // Given a function that returns bindings, create and return a new object that contains
      // binding value-accessors functions. Each accessor function calls the original function
      // so that it always gets the latest value and all dependencies are captured. This is used
      // by ko.applyBindingsToNode and getBindingsAndMakeAccessors.
      function makeAccessorsFromFunction(callback) {
          return ko.utils.objectMap(ko.dependencyDetection.ignore(callback), function(value, key) {
              return function() {
                  return callback()[key];
              };
          });
      }
  
      // Given a bindings function or object, create and return a new object that contains
      // binding value-accessors functions. This is used by ko.applyBindingsToNode.
      function makeBindingAccessors(bindings, context, node) {
          if (typeof bindings === 'function') {
              return makeAccessorsFromFunction(bindings.bind(null, context, node));
          } else {
              return ko.utils.objectMap(bindings, makeValueAccessor);
          }
      }
  
      // This function is used if the binding provider doesn't include a getBindingAccessors function.
      // It must be called with 'this' set to the provider instance.
      function getBindingsAndMakeAccessors(node, context) {
          return makeAccessorsFromFunction(this['getBindings'].bind(this, node, context));
      }
  
      function validateThatBindingIsAllowedForVirtualElements(bindingName) {
          var validator = ko.virtualElements.allowedBindings[bindingName];
          if (!validator)
              throw new Error("The binding '" + bindingName + "' cannot be used with virtual elements")
      }
  
      function applyBindingsToDescendantsInternal (bindingContext, elementOrVirtualElement, bindingContextsMayDifferFromDomParentElement) {
          var currentChild,
              nextInQueue = ko.virtualElements.firstChild(elementOrVirtualElement),
              provider = ko.bindingProvider['instance'],
              preprocessNode = provider['preprocessNode'];
  
          // Preprocessing allows a binding provider to mutate a node before bindings are applied to it. For example it's
          // possible to insert new siblings after it, and/or replace the node with a different one. This can be used to
          // implement custom binding syntaxes, such as {{ value }} for string interpolation, or custom element types that
          // trigger insertion of <template> contents at that point in the document.
          if (preprocessNode) {
              while (currentChild = nextInQueue) {
                  nextInQueue = ko.virtualElements.nextSibling(currentChild);
                  preprocessNode.call(provider, currentChild);
              }
              // Reset nextInQueue for the next loop
              nextInQueue = ko.virtualElements.firstChild(elementOrVirtualElement);
          }
  
          while (currentChild = nextInQueue) {
              // Keep a record of the next child *before* applying bindings, in case the binding removes the current child from its position
              nextInQueue = ko.virtualElements.nextSibling(currentChild);
              applyBindingsToNodeAndDescendantsInternal(bindingContext, currentChild, bindingContextsMayDifferFromDomParentElement);
          }
      }
  
      function applyBindingsToNodeAndDescendantsInternal (bindingContext, nodeVerified, bindingContextMayDifferFromDomParentElement) {
          var shouldBindDescendants = true;
  
          // Perf optimisation: Apply bindings only if...
          // (1) We need to store the binding context on this node (because it may differ from the DOM parent node's binding context)
          //     Note that we can't store binding contexts on non-elements (e.g., text nodes), as IE doesn't allow expando properties for those
          // (2) It might have bindings (e.g., it has a data-bind attribute, or it's a marker for a containerless template)
          var isElement = (nodeVerified.nodeType === 1);
          if (isElement) // Workaround IE <= 8 HTML parsing weirdness
              ko.virtualElements.normaliseVirtualElementDomStructure(nodeVerified);
  
          var shouldApplyBindings = (isElement && bindingContextMayDifferFromDomParentElement)             // Case (1)
                                 || ko.bindingProvider['instance']['nodeHasBindings'](nodeVerified);       // Case (2)
          if (shouldApplyBindings)
              shouldBindDescendants = applyBindingsToNodeInternal(nodeVerified, null, bindingContext, bindingContextMayDifferFromDomParentElement)['shouldBindDescendants'];
  
          if (shouldBindDescendants && !bindingDoesNotRecurseIntoElementTypes[ko.utils.tagNameLower(nodeVerified)]) {
              // We're recursing automatically into (real or virtual) child nodes without changing binding contexts. So,
              //  * For children of a *real* element, the binding context is certainly the same as on their DOM .parentNode,
              //    hence bindingContextsMayDifferFromDomParentElement is false
              //  * For children of a *virtual* element, we can't be sure. Evaluating .parentNode on those children may
              //    skip over any number of intermediate virtual elements, any of which might define a custom binding context,
              //    hence bindingContextsMayDifferFromDomParentElement is true
              applyBindingsToDescendantsInternal(bindingContext, nodeVerified, /* bindingContextsMayDifferFromDomParentElement: */ !isElement);
          }
      }
  
      var boundElementDomDataKey = ko.utils.domData.nextKey();
  
  
      function topologicalSortBindings(bindings) {
          // Depth-first sort
          var result = [],                // The list of key/handler pairs that we will return
              bindingsConsidered = {},    // A temporary record of which bindings are already in 'result'
              cyclicDependencyStack = []; // Keeps track of a depth-search so that, if there's a cycle, we know which bindings caused it
          ko.utils.objectForEach(bindings, function pushBinding(bindingKey) {
              if (!bindingsConsidered[bindingKey]) {
                  var binding = ko['getBindingHandler'](bindingKey);
                  if (binding) {
                      // First add dependencies (if any) of the current binding
                      if (binding['after']) {
                          cyclicDependencyStack.push(bindingKey);
                          ko.utils.arrayForEach(binding['after'], function(bindingDependencyKey) {
                              if (bindings[bindingDependencyKey]) {
                                  if (ko.utils.arrayIndexOf(cyclicDependencyStack, bindingDependencyKey) !== -1) {
                                      throw Error("Cannot combine the following bindings, because they have a cyclic dependency: " + cyclicDependencyStack.join(", "));
                                  } else {
                                      pushBinding(bindingDependencyKey);
                                  }
                              }
                          });
                          cyclicDependencyStack.length--;
                      }
                      // Next add the current binding
                      result.push({ key: bindingKey, handler: binding });
                  }
                  bindingsConsidered[bindingKey] = true;
              }
          });
  
          return result;
      }
  
      function applyBindingsToNodeInternal(node, sourceBindings, bindingContext, bindingContextMayDifferFromDomParentElement) {
          // Prevent multiple applyBindings calls for the same node, except when a binding value is specified
          var alreadyBound = ko.utils.domData.get(node, boundElementDomDataKey);
          if (!sourceBindings) {
              if (alreadyBound) {
                  throw Error("You cannot apply bindings multiple times to the same element.");
              }
              ko.utils.domData.set(node, boundElementDomDataKey, true);
          }
  
          // Optimization: Don't store the binding context on this node if it's definitely the same as on node.parentNode, because
          // we can easily recover it just by scanning up the node's ancestors in the DOM
          // (note: here, parent node means "real DOM parent" not "virtual parent", as there's no O(1) way to find the virtual parent)
          if (!alreadyBound && bindingContextMayDifferFromDomParentElement)
              ko.storedBindingContextForNode(node, bindingContext);
  
          // Use bindings if given, otherwise fall back on asking the bindings provider to give us some bindings
          var bindings;
          if (sourceBindings && typeof sourceBindings !== 'function') {
              bindings = sourceBindings;
          } else {
              var provider = ko.bindingProvider['instance'],
                  getBindings = provider['getBindingAccessors'] || getBindingsAndMakeAccessors;
  
              // Get the binding from the provider within a computed observable so that we can update the bindings whenever
              // the binding context is updated or if the binding provider accesses observables.
              var bindingsUpdater = ko.dependentObservable(
                  function() {
                      bindings = sourceBindings ? sourceBindings(bindingContext, node) : getBindings.call(provider, node, bindingContext);
                      // Register a dependency on the binding context to support observable view models.
                      if (bindings && bindingContext._subscribable)
                          bindingContext._subscribable();
                      return bindings;
                  },
                  null, { disposeWhenNodeIsRemoved: node }
              );
  
              if (!bindings || !bindingsUpdater.isActive())
                  bindingsUpdater = null;
          }
  
          var bindingHandlerThatControlsDescendantBindings;
          if (bindings) {
              // Return the value accessor for a given binding. When bindings are static (won't be updated because of a binding
              // context update), just return the value accessor from the binding. Otherwise, return a function that always gets
              // the latest binding value and registers a dependency on the binding updater.
              var getValueAccessor = bindingsUpdater
                  ? function(bindingKey) {
                      return function() {
                          return evaluateValueAccessor(bindingsUpdater()[bindingKey]);
                      };
                  } : function(bindingKey) {
                      return bindings[bindingKey];
                  };
  
              // Use of allBindings as a function is maintained for backwards compatibility, but its use is deprecated
              function allBindings() {
                  return ko.utils.objectMap(bindingsUpdater ? bindingsUpdater() : bindings, evaluateValueAccessor);
              }
              // The following is the 3.x allBindings API
              allBindings['get'] = function(key) {
                  return bindings[key] && evaluateValueAccessor(getValueAccessor(key));
              };
              allBindings['has'] = function(key) {
                  return key in bindings;
              };
  
              // First put the bindings into the right order
              var orderedBindings = topologicalSortBindings(bindings);
  
              // Go through the sorted bindings, calling init and update for each
              ko.utils.arrayForEach(orderedBindings, function(bindingKeyAndHandler) {
                  // Note that topologicalSortBindings has already filtered out any nonexistent binding handlers,
                  // so bindingKeyAndHandler.handler will always be nonnull.
                  var handlerInitFn = bindingKeyAndHandler.handler["init"],
                      handlerUpdateFn = bindingKeyAndHandler.handler["update"],
                      bindingKey = bindingKeyAndHandler.key;
  
                  if (node.nodeType === 8) {
                      validateThatBindingIsAllowedForVirtualElements(bindingKey);
                  }
  
                  try {
                      // Run init, ignoring any dependencies
                      if (typeof handlerInitFn == "function") {
                          ko.dependencyDetection.ignore(function() {
                              var initResult = handlerInitFn(node, getValueAccessor(bindingKey), allBindings, bindingContext['$data'], bindingContext);
  
                              // If this binding handler claims to control descendant bindings, make a note of this
                              if (initResult && initResult['controlsDescendantBindings']) {
                                  if (bindingHandlerThatControlsDescendantBindings !== undefined)
                                      throw new Error("Multiple bindings (" + bindingHandlerThatControlsDescendantBindings + " and " + bindingKey + ") are trying to control descendant bindings of the same element. You cannot use these bindings together on the same element.");
                                  bindingHandlerThatControlsDescendantBindings = bindingKey;
                              }
                          });
                      }
  
                      // Run update in its own computed wrapper
                      if (typeof handlerUpdateFn == "function") {
                          ko.dependentObservable(
                              function() {
                                  handlerUpdateFn(node, getValueAccessor(bindingKey), allBindings, bindingContext['$data'], bindingContext);
                              },
                              null,
                              { disposeWhenNodeIsRemoved: node }
                          );
                      }
                  } catch (ex) {
                      ex.message = "Unable to process binding \"" + bindingKey + ": " + bindings[bindingKey] + "\"\nMessage: " + ex.message;
                      throw ex;
                  }
              });
          }
  
          return {
              'shouldBindDescendants': bindingHandlerThatControlsDescendantBindings === undefined
          };
      };
  
      var storedBindingContextDomDataKey = ko.utils.domData.nextKey();
      ko.storedBindingContextForNode = function (node, bindingContext) {
          if (arguments.length == 2) {
              ko.utils.domData.set(node, storedBindingContextDomDataKey, bindingContext);
              if (bindingContext._subscribable)
                  bindingContext._subscribable._addNode(node);
          } else {
              return ko.utils.domData.get(node, storedBindingContextDomDataKey);
          }
      }
  
      function getBindingContext(viewModelOrBindingContext) {
          return viewModelOrBindingContext && (viewModelOrBindingContext instanceof ko.bindingContext)
              ? viewModelOrBindingContext
              : new ko.bindingContext(viewModelOrBindingContext);
      }
  
      ko.applyBindingAccessorsToNode = function (node, bindings, viewModelOrBindingContext) {
          if (node.nodeType === 1) // If it's an element, workaround IE <= 8 HTML parsing weirdness
              ko.virtualElements.normaliseVirtualElementDomStructure(node);
          return applyBindingsToNodeInternal(node, bindings, getBindingContext(viewModelOrBindingContext), true);
      };
  
      ko.applyBindingsToNode = function (node, bindings, viewModelOrBindingContext) {
          var context = getBindingContext(viewModelOrBindingContext);
          return ko.applyBindingAccessorsToNode(node, makeBindingAccessors(bindings, context, node), context);
      };
  
      ko.applyBindingsToDescendants = function(viewModelOrBindingContext, rootNode) {
          if (rootNode.nodeType === 1 || rootNode.nodeType === 8)
              applyBindingsToDescendantsInternal(getBindingContext(viewModelOrBindingContext), rootNode, true);
      };
  
      ko.applyBindings = function (viewModelOrBindingContext, rootNode) {
          // If jQuery is loaded after Knockout, we won't initially have access to it. So save it here.
          if (!jQueryInstance && window['jQuery']) {
              jQueryInstance = window['jQuery'];
          }
  
          if (rootNode && (rootNode.nodeType !== 1) && (rootNode.nodeType !== 8))
              throw new Error("ko.applyBindings: first parameter should be your view model; second parameter should be a DOM node");
          rootNode = rootNode || window.document.body; // Make "rootNode" parameter optional
  
          applyBindingsToNodeAndDescendantsInternal(getBindingContext(viewModelOrBindingContext), rootNode, true);
      };
  
      // Retrieving binding context from arbitrary nodes
      ko.contextFor = function(node) {
          // We can only do something meaningful for elements and comment nodes (in particular, not text nodes, as IE can't store domdata for them)
          switch (node.nodeType) {
              case 1:
              case 8:
                  var context = ko.storedBindingContextForNode(node);
                  if (context) return context;
                  if (node.parentNode) return ko.contextFor(node.parentNode);
                  break;
          }
          return undefined;
      };
      ko.dataFor = function(node) {
          var context = ko.contextFor(node);
          return context ? context['$data'] : undefined;
      };
  
      ko.exportSymbol('bindingHandlers', ko.bindingHandlers);
      ko.exportSymbol('applyBindings', ko.applyBindings);
      ko.exportSymbol('applyBindingsToDescendants', ko.applyBindingsToDescendants);
      ko.exportSymbol('applyBindingAccessorsToNode', ko.applyBindingAccessorsToNode);
      ko.exportSymbol('applyBindingsToNode', ko.applyBindingsToNode);
      ko.exportSymbol('contextFor', ko.contextFor);
      ko.exportSymbol('dataFor', ko.dataFor);
  })();
  (function(undefined) {
      var loadingSubscribablesCache = {}, // Tracks component loads that are currently in flight
          loadedDefinitionsCache = {};    // Tracks component loads that have already completed
  
      ko.components = {
          get: function(componentName, callback) {
              var cachedDefinition = getObjectOwnProperty(loadedDefinitionsCache, componentName);
              if (cachedDefinition) {
                  // It's already loaded and cached. Reuse the same definition object.
                  // Note that for API consistency, even cache hits complete asynchronously by default.
                  // You can bypass this by putting synchronous:true on your component config.
                  if (cachedDefinition.isSynchronousComponent) {
                      ko.dependencyDetection.ignore(function() { // See comment in loaderRegistryBehaviors.js for reasoning
                          callback(cachedDefinition.definition);
                      });
                  } else {
                      ko.tasks.schedule(function() { callback(cachedDefinition.definition); });
                  }
              } else {
                  // Join the loading process that is already underway, or start a new one.
                  loadComponentAndNotify(componentName, callback);
              }
          },
  
          clearCachedDefinition: function(componentName) {
              delete loadedDefinitionsCache[componentName];
          },
  
          _getFirstResultFromLoaders: getFirstResultFromLoaders
      };
  
      function getObjectOwnProperty(obj, propName) {
          return obj.hasOwnProperty(propName) ? obj[propName] : undefined;
      }
  
      function loadComponentAndNotify(componentName, callback) {
          var subscribable = getObjectOwnProperty(loadingSubscribablesCache, componentName),
              completedAsync;
          if (!subscribable) {
              // It's not started loading yet. Start loading, and when it's done, move it to loadedDefinitionsCache.
              subscribable = loadingSubscribablesCache[componentName] = new ko.subscribable();
              subscribable.subscribe(callback);
  
              beginLoadingComponent(componentName, function(definition, config) {
                  var isSynchronousComponent = !!(config && config['synchronous']);
                  loadedDefinitionsCache[componentName] = { definition: definition, isSynchronousComponent: isSynchronousComponent };
                  delete loadingSubscribablesCache[componentName];
  
                  // For API consistency, all loads complete asynchronously. However we want to avoid
                  // adding an extra task schedule if it's unnecessary (i.e., the completion is already
                  // async).
                  //
                  // You can bypass the 'always asynchronous' feature by putting the synchronous:true
                  // flag on your component configuration when you register it.
                  if (completedAsync || isSynchronousComponent) {
                      // Note that notifySubscribers ignores any dependencies read within the callback.
                      // See comment in loaderRegistryBehaviors.js for reasoning
                      subscribable['notifySubscribers'](definition);
                  } else {
                      ko.tasks.schedule(function() {
                          subscribable['notifySubscribers'](definition);
                      });
                  }
              });
              completedAsync = true;
          } else {
              subscribable.subscribe(callback);
          }
      }
  
      function beginLoadingComponent(componentName, callback) {
          getFirstResultFromLoaders('getConfig', [componentName], function(config) {
              if (config) {
                  // We have a config, so now load its definition
                  getFirstResultFromLoaders('loadComponent', [componentName, config], function(definition) {
                      callback(definition, config);
                  });
              } else {
                  // The component has no config - it's unknown to all the loaders.
                  // Note that this is not an error (e.g., a module loading error) - that would abort the
                  // process and this callback would not run. For this callback to run, all loaders must
                  // have confirmed they don't know about this component.
                  callback(null, null);
              }
          });
      }
  
      function getFirstResultFromLoaders(methodName, argsExceptCallback, callback, candidateLoaders) {
          // On the first call in the stack, start with the full set of loaders
          if (!candidateLoaders) {
              candidateLoaders = ko.components['loaders'].slice(0); // Use a copy, because we'll be mutating this array
          }
  
          // Try the next candidate
          var currentCandidateLoader = candidateLoaders.shift();
          if (currentCandidateLoader) {
              var methodInstance = currentCandidateLoader[methodName];
              if (methodInstance) {
                  var wasAborted = false,
                      synchronousReturnValue = methodInstance.apply(currentCandidateLoader, argsExceptCallback.concat(function(result) {
                          if (wasAborted) {
                              callback(null);
                          } else if (result !== null) {
                              // This candidate returned a value. Use it.
                              callback(result);
                          } else {
                              // Try the next candidate
                              getFirstResultFromLoaders(methodName, argsExceptCallback, callback, candidateLoaders);
                          }
                      }));
  
                  // Currently, loaders may not return anything synchronously. This leaves open the possibility
                  // that we'll extend the API to support synchronous return values in the future. It won't be
                  // a breaking change, because currently no loader is allowed to return anything except undefined.
                  if (synchronousReturnValue !== undefined) {
                      wasAborted = true;
  
                      // Method to suppress exceptions will remain undocumented. This is only to keep
                      // KO's specs running tidily, since we can observe the loading got aborted without
                      // having exceptions cluttering up the console too.
                      if (!currentCandidateLoader['suppressLoaderExceptions']) {
                          throw new Error('Component loaders must supply values by invoking the callback, not by returning values synchronously.');
                      }
                  }
              } else {
                  // This candidate doesn't have the relevant handler. Synchronously move on to the next one.
                  getFirstResultFromLoaders(methodName, argsExceptCallback, callback, candidateLoaders);
              }
          } else {
              // No candidates returned a value
              callback(null);
          }
      }
  
      // Reference the loaders via string name so it's possible for developers
      // to replace the whole array by assigning to ko.components.loaders
      ko.components['loaders'] = [];
  
      ko.exportSymbol('components', ko.components);
      ko.exportSymbol('components.get', ko.components.get);
      ko.exportSymbol('components.clearCachedDefinition', ko.components.clearCachedDefinition);
  })();
  (function(undefined) {
  
      // The default loader is responsible for two things:
      // 1. Maintaining the default in-memory registry of component configuration objects
      //    (i.e., the thing you're writing to when you call ko.components.register(someName, ...))
      // 2. Answering requests for components by fetching configuration objects
      //    from that default in-memory registry and resolving them into standard
      //    component definition objects (of the form { createViewModel: ..., template: ... })
      // Custom loaders may override either of these facilities, i.e.,
      // 1. To supply configuration objects from some other source (e.g., conventions)
      // 2. Or, to resolve configuration objects by loading viewmodels/templates via arbitrary logic.
  
      var defaultConfigRegistry = {};
  
      ko.components.register = function(componentName, config) {
          if (!config) {
              throw new Error('Invalid configuration for ' + componentName);
          }
  
          if (ko.components.isRegistered(componentName)) {
              throw new Error('Component ' + componentName + ' is already registered');
          }
  
          defaultConfigRegistry[componentName] = config;
      };
  
      ko.components.isRegistered = function(componentName) {
          return defaultConfigRegistry.hasOwnProperty(componentName);
      };
  
      ko.components.unregister = function(componentName) {
          delete defaultConfigRegistry[componentName];
          ko.components.clearCachedDefinition(componentName);
      };
  
      ko.components.defaultLoader = {
          'getConfig': function(componentName, callback) {
              var result = defaultConfigRegistry.hasOwnProperty(componentName)
                  ? defaultConfigRegistry[componentName]
                  : null;
              callback(result);
          },
  
          'loadComponent': function(componentName, config, callback) {
              var errorCallback = makeErrorCallback(componentName);
              possiblyGetConfigFromAmd(errorCallback, config, function(loadedConfig) {
                  resolveConfig(componentName, errorCallback, loadedConfig, callback);
              });
          },
  
          'loadTemplate': function(componentName, templateConfig, callback) {
              resolveTemplate(makeErrorCallback(componentName), templateConfig, callback);
          },
  
          'loadViewModel': function(componentName, viewModelConfig, callback) {
              resolveViewModel(makeErrorCallback(componentName), viewModelConfig, callback);
          }
      };
  
      var createViewModelKey = 'createViewModel';
  
      // Takes a config object of the form { template: ..., viewModel: ... }, and asynchronously convert it
      // into the standard component definition format:
      //    { template: <ArrayOfDomNodes>, createViewModel: function(params, componentInfo) { ... } }.
      // Since both template and viewModel may need to be resolved asynchronously, both tasks are performed
      // in parallel, and the results joined when both are ready. We don't depend on any promises infrastructure,
      // so this is implemented manually below.
      function resolveConfig(componentName, errorCallback, config, callback) {
          var result = {},
              makeCallBackWhenZero = 2,
              tryIssueCallback = function() {
                  if (--makeCallBackWhenZero === 0) {
                      callback(result);
                  }
              },
              templateConfig = config['template'],
              viewModelConfig = config['viewModel'];
  
          if (templateConfig) {
              possiblyGetConfigFromAmd(errorCallback, templateConfig, function(loadedConfig) {
                  ko.components._getFirstResultFromLoaders('loadTemplate', [componentName, loadedConfig], function(resolvedTemplate) {
                      result['template'] = resolvedTemplate;
                      tryIssueCallback();
                  });
              });
          } else {
              tryIssueCallback();
          }
  
          if (viewModelConfig) {
              possiblyGetConfigFromAmd(errorCallback, viewModelConfig, function(loadedConfig) {
                  ko.components._getFirstResultFromLoaders('loadViewModel', [componentName, loadedConfig], function(resolvedViewModel) {
                      result[createViewModelKey] = resolvedViewModel;
                      tryIssueCallback();
                  });
              });
          } else {
              tryIssueCallback();
          }
      }
  
      function resolveTemplate(errorCallback, templateConfig, callback) {
          if (typeof templateConfig === 'string') {
              // Markup - parse it
              callback(ko.utils.parseHtmlFragment(templateConfig));
          } else if (templateConfig instanceof Array) {
              // Assume already an array of DOM nodes - pass through unchanged
              callback(templateConfig);
          } else if (isDocumentFragment(templateConfig)) {
              // Document fragment - use its child nodes
              callback(ko.utils.makeArray(templateConfig.childNodes));
          } else if (templateConfig['element']) {
              var element = templateConfig['element'];
              if (isDomElement(element)) {
                  // Element instance - copy its child nodes
                  callback(cloneNodesFromTemplateSourceElement(element));
              } else if (typeof element === 'string') {
                  // Element ID - find it, then copy its child nodes
                  var elemInstance = document.getElementById(element);
                  if (elemInstance) {
                      callback(cloneNodesFromTemplateSourceElement(elemInstance));
                  } else {
                      errorCallback('Cannot find element with ID ' + element);
                  }
              } else {
                  errorCallback('Unknown element type: ' + element);
              }
          } else {
              errorCallback('Unknown template value: ' + templateConfig);
          }
      }
  
      function resolveViewModel(errorCallback, viewModelConfig, callback) {
          if (typeof viewModelConfig === 'function') {
              // Constructor - convert to standard factory function format
              // By design, this does *not* supply componentInfo to the constructor, as the intent is that
              // componentInfo contains non-viewmodel data (e.g., the component's element) that should only
              // be used in factory functions, not viewmodel constructors.
              callback(function (params /*, componentInfo */) {
                  return new viewModelConfig(params);
              });
          } else if (typeof viewModelConfig[createViewModelKey] === 'function') {
              // Already a factory function - use it as-is
              callback(viewModelConfig[createViewModelKey]);
          } else if ('instance' in viewModelConfig) {
              // Fixed object instance - promote to createViewModel format for API consistency
              var fixedInstance = viewModelConfig['instance'];
              callback(function (params, componentInfo) {
                  return fixedInstance;
              });
          } else if ('viewModel' in viewModelConfig) {
              // Resolved AMD module whose value is of the form { viewModel: ... }
              resolveViewModel(errorCallback, viewModelConfig['viewModel'], callback);
          } else {
              errorCallback('Unknown viewModel value: ' + viewModelConfig);
          }
      }
  
      function cloneNodesFromTemplateSourceElement(elemInstance) {
          switch (ko.utils.tagNameLower(elemInstance)) {
              case 'script':
                  return ko.utils.parseHtmlFragment(elemInstance.text);
              case 'textarea':
                  return ko.utils.parseHtmlFragment(elemInstance.value);
              case 'template':
                  // For browsers with proper <template> element support (i.e., where the .content property
                  // gives a document fragment), use that document fragment.
                  if (isDocumentFragment(elemInstance.content)) {
                      return ko.utils.cloneNodes(elemInstance.content.childNodes);
                  }
          }
  
          // Regular elements such as <div>, and <template> elements on old browsers that don't really
          // understand <template> and just treat it as a regular container
          return ko.utils.cloneNodes(elemInstance.childNodes);
      }
  
      function isDomElement(obj) {
          if (window['HTMLElement']) {
              return obj instanceof HTMLElement;
          } else {
              return obj && obj.tagName && obj.nodeType === 1;
          }
      }
  
      function isDocumentFragment(obj) {
          if (window['DocumentFragment']) {
              return obj instanceof DocumentFragment;
          } else {
              return obj && obj.nodeType === 11;
          }
      }
  
      function possiblyGetConfigFromAmd(errorCallback, config, callback) {
          if (typeof config['require'] === 'string') {
              // The config is the value of an AMD module
              if (amdRequire || window['require']) {
                  (amdRequire || window['require'])([config['require']], callback);
              } else {
                  errorCallback('Uses require, but no AMD loader is present');
              }
          } else {
              callback(config);
          }
      }
  
      function makeErrorCallback(componentName) {
          return function (message) {
              throw new Error('Component \'' + componentName + '\': ' + message);
          };
      }
  
      ko.exportSymbol('components.register', ko.components.register);
      ko.exportSymbol('components.isRegistered', ko.components.isRegistered);
      ko.exportSymbol('components.unregister', ko.components.unregister);
  
      // Expose the default loader so that developers can directly ask it for configuration
      // or to resolve configuration
      ko.exportSymbol('components.defaultLoader', ko.components.defaultLoader);
  
      // By default, the default loader is the only registered component loader
      ko.components['loaders'].push(ko.components.defaultLoader);
  
      // Privately expose the underlying config registry for use in old-IE shim
      ko.components._allRegisteredComponents = defaultConfigRegistry;
  })();
  (function (undefined) {
      // Overridable API for determining which component name applies to a given node. By overriding this,
      // you can for example map specific tagNames to components that are not preregistered.
      ko.components['getComponentNameForNode'] = function(node) {
          var tagNameLower = ko.utils.tagNameLower(node);
          if (ko.components.isRegistered(tagNameLower)) {
              // Try to determine that this node can be considered a *custom* element; see https://github.com/knockout/knockout/issues/1603
              if (tagNameLower.indexOf('-') != -1 || ('' + node) == "[object HTMLUnknownElement]" || (ko.utils.ieVersion <= 8 && node.tagName === tagNameLower)) {
                  return tagNameLower;
              }
          }
      };
  
      ko.components.addBindingsForCustomElement = function(allBindings, node, bindingContext, valueAccessors) {
          // Determine if it's really a custom element matching a component
          if (node.nodeType === 1) {
              var componentName = ko.components['getComponentNameForNode'](node);
              if (componentName) {
                  // It does represent a component, so add a component binding for it
                  allBindings = allBindings || {};
  
                  if (allBindings['component']) {
                      // Avoid silently overwriting some other 'component' binding that may already be on the element
                      throw new Error('Cannot use the "component" binding on a custom element matching a component');
                  }
  
                  var componentBindingValue = { 'name': componentName, 'params': getComponentParamsFromCustomElement(node, bindingContext) };
  
                  allBindings['component'] = valueAccessors
                      ? function() { return componentBindingValue; }
                      : componentBindingValue;
              }
          }
  
          return allBindings;
      }
  
      var nativeBindingProviderInstance = new ko.bindingProvider();
  
      function getComponentParamsFromCustomElement(elem, bindingContext) {
          var paramsAttribute = elem.getAttribute('params');
  
          if (paramsAttribute) {
              var params = nativeBindingProviderInstance['parseBindingsString'](paramsAttribute, bindingContext, elem, { 'valueAccessors': true, 'bindingParams': true }),
                  rawParamComputedValues = ko.utils.objectMap(params, function(paramValue, paramName) {
                      return ko.computed(paramValue, null, { disposeWhenNodeIsRemoved: elem });
                  }),
                  result = ko.utils.objectMap(rawParamComputedValues, function(paramValueComputed, paramName) {
                      var paramValue = paramValueComputed.peek();
                      // Does the evaluation of the parameter value unwrap any observables?
                      if (!paramValueComputed.isActive()) {
                          // No it doesn't, so there's no need for any computed wrapper. Just pass through the supplied value directly.
                          // Example: "someVal: firstName, age: 123" (whether or not firstName is an observable/computed)
                          return paramValue;
                      } else {
                          // Yes it does. Supply a computed property that unwraps both the outer (binding expression)
                          // level of observability, and any inner (resulting model value) level of observability.
                          // This means the component doesn't have to worry about multiple unwrapping. If the value is a
                          // writable observable, the computed will also be writable and pass the value on to the observable.
                          return ko.computed({
                              'read': function() {
                                  return ko.utils.unwrapObservable(paramValueComputed());
                              },
                              'write': ko.isWriteableObservable(paramValue) && function(value) {
                                  paramValueComputed()(value);
                              },
                              disposeWhenNodeIsRemoved: elem
                          });
                      }
                  });
  
              // Give access to the raw computeds, as long as that wouldn't overwrite any custom param also called '$raw'
              // This is in case the developer wants to react to outer (binding) observability separately from inner
              // (model value) observability, or in case the model value observable has subobservables.
              if (!result.hasOwnProperty('$raw')) {
                  result['$raw'] = rawParamComputedValues;
              }
  
              return result;
          } else {
              // For consistency, absence of a "params" attribute is treated the same as the presence of
              // any empty one. Otherwise component viewmodels need special code to check whether or not
              // 'params' or 'params.$raw' is null/undefined before reading subproperties, which is annoying.
              return { '$raw': {} };
          }
      }
  
      // --------------------------------------------------------------------------------
      // Compatibility code for older (pre-HTML5) IE browsers
  
      if (ko.utils.ieVersion < 9) {
          // Whenever you preregister a component, enable it as a custom element in the current document
          ko.components['register'] = (function(originalFunction) {
              return function(componentName) {
                  document.createElement(componentName); // Allows IE<9 to parse markup containing the custom element
                  return originalFunction.apply(this, arguments);
              }
          })(ko.components['register']);
  
          // Whenever you create a document fragment, enable all preregistered component names as custom elements
          // This is needed to make innerShiv/jQuery HTML parsing correctly handle the custom elements
          document.createDocumentFragment = (function(originalFunction) {
              return function() {
                  var newDocFrag = originalFunction(),
                      allComponents = ko.components._allRegisteredComponents;
                  for (var componentName in allComponents) {
                      if (allComponents.hasOwnProperty(componentName)) {
                          newDocFrag.createElement(componentName);
                      }
                  }
                  return newDocFrag;
              };
          })(document.createDocumentFragment);
      }
  })();(function(undefined) {
  
      var componentLoadingOperationUniqueId = 0;
  
      ko.bindingHandlers['component'] = {
          'init': function(element, valueAccessor, ignored1, ignored2, bindingContext) {
              var currentViewModel,
                  currentLoadingOperationId,
                  disposeAssociatedComponentViewModel = function () {
                      var currentViewModelDispose = currentViewModel && currentViewModel['dispose'];
                      if (typeof currentViewModelDispose === 'function') {
                          currentViewModelDispose.call(currentViewModel);
                      }
                      currentViewModel = null;
                      // Any in-flight loading operation is no longer relevant, so make sure we ignore its completion
                      currentLoadingOperationId = null;
                  },
                  originalChildNodes = ko.utils.makeArray(ko.virtualElements.childNodes(element));
  
              ko.utils.domNodeDisposal.addDisposeCallback(element, disposeAssociatedComponentViewModel);
  
              ko.computed(function () {
                  var value = ko.utils.unwrapObservable(valueAccessor()),
                      componentName, componentParams;
  
                  if (typeof value === 'string') {
                      componentName = value;
                  } else {
                      componentName = ko.utils.unwrapObservable(value['name']);
                      componentParams = ko.utils.unwrapObservable(value['params']);
                  }
  
                  if (!componentName) {
                      throw new Error('No component name specified');
                  }
  
                  var loadingOperationId = currentLoadingOperationId = ++componentLoadingOperationUniqueId;
                  ko.components.get(componentName, function(componentDefinition) {
                      // If this is not the current load operation for this element, ignore it.
                      if (currentLoadingOperationId !== loadingOperationId) {
                          return;
                      }
  
                      // Clean up previous state
                      disposeAssociatedComponentViewModel();
  
                      // Instantiate and bind new component. Implicitly this cleans any old DOM nodes.
                      if (!componentDefinition) {
                          throw new Error('Unknown component \'' + componentName + '\'');
                      }
                      cloneTemplateIntoElement(componentName, componentDefinition, element);
                      var componentViewModel = createViewModel(componentDefinition, element, originalChildNodes, componentParams),
                          childBindingContext = bindingContext['createChildContext'](componentViewModel, /* dataItemAlias */ undefined, function(ctx) {
                              ctx['$component'] = componentViewModel;
                              ctx['$componentTemplateNodes'] = originalChildNodes;
                          });
                      currentViewModel = componentViewModel;
                      ko.applyBindingsToDescendants(childBindingContext, element);
                  });
              }, null, { disposeWhenNodeIsRemoved: element });
  
              return { 'controlsDescendantBindings': true };
          }
      };
  
      ko.virtualElements.allowedBindings['component'] = true;
  
      function cloneTemplateIntoElement(componentName, componentDefinition, element) {
          var template = componentDefinition['template'];
          if (!template) {
              throw new Error('Component \'' + componentName + '\' has no template');
          }
  
          var clonedNodesArray = ko.utils.cloneNodes(template);
          ko.virtualElements.setDomNodeChildren(element, clonedNodesArray);
      }
  
      function createViewModel(componentDefinition, element, originalChildNodes, componentParams) {
          var componentViewModelFactory = componentDefinition['createViewModel'];
          return componentViewModelFactory
              ? componentViewModelFactory.call(componentDefinition, componentParams, { 'element': element, 'templateNodes': originalChildNodes })
              : componentParams; // Template-only component
      }
  
  })();
  var attrHtmlToJavascriptMap = { 'class': 'className', 'for': 'htmlFor' };
  ko.bindingHandlers['attr'] = {
      'update': function(element, valueAccessor, allBindings) {
          var value = ko.utils.unwrapObservable(valueAccessor()) || {};
          ko.utils.objectForEach(value, function(attrName, attrValue) {
              attrValue = ko.utils.unwrapObservable(attrValue);
  
              // To cover cases like "attr: { checked:someProp }", we want to remove the attribute entirely
              // when someProp is a "no value"-like value (strictly null, false, or undefined)
              // (because the absence of the "checked" attr is how to mark an element as not checked, etc.)
              var toRemove = (attrValue === false) || (attrValue === null) || (attrValue === undefined);
              if (toRemove)
                  element.removeAttribute(attrName);
  
              // In IE <= 7 and IE8 Quirks Mode, you have to use the Javascript property name instead of the
              // HTML attribute name for certain attributes. IE8 Standards Mode supports the correct behavior,
              // but instead of figuring out the mode, we'll just set the attribute through the Javascript
              // property for IE <= 8.
              if (ko.utils.ieVersion <= 8 && attrName in attrHtmlToJavascriptMap) {
                  attrName = attrHtmlToJavascriptMap[attrName];
                  if (toRemove)
                      element.removeAttribute(attrName);
                  else
                      element[attrName] = attrValue;
              } else if (!toRemove) {
                  element.setAttribute(attrName, attrValue.toString());
              }
  
              // Treat "name" specially - although you can think of it as an attribute, it also needs
              // special handling on older versions of IE (https://github.com/SteveSanderson/knockout/pull/333)
              // Deliberately being case-sensitive here because XHTML would regard "Name" as a different thing
              // entirely, and there's no strong reason to allow for such casing in HTML.
              if (attrName === "name") {
                  ko.utils.setElementName(element, toRemove ? "" : attrValue.toString());
              }
          });
      }
  };
  (function() {
  
  ko.bindingHandlers['checked'] = {
      'after': ['value', 'attr'],
      'init': function (element, valueAccessor, allBindings) {
          var checkedValue = ko.pureComputed(function() {
              // Treat "value" like "checkedValue" when it is included with "checked" binding
              if (allBindings['has']('checkedValue')) {
                  return ko.utils.unwrapObservable(allBindings.get('checkedValue'));
              } else if (allBindings['has']('value')) {
                  return ko.utils.unwrapObservable(allBindings.get('value'));
              }
  
              return element.value;
          });
  
          function updateModel() {
              // This updates the model value from the view value.
              // It runs in response to DOM events (click) and changes in checkedValue.
              var isChecked = element.checked,
                  elemValue = useCheckedValue ? checkedValue() : isChecked;
  
              // When we're first setting up this computed, don't change any model state.
              if (ko.computedContext.isInitial()) {
                  return;
              }
  
              // We can ignore unchecked radio buttons, because some other radio
              // button will be getting checked, and that one can take care of updating state.
              if (isRadio && !isChecked) {
                  return;
              }
  
              var modelValue = ko.dependencyDetection.ignore(valueAccessor);
              if (valueIsArray) {
                  var writableValue = rawValueIsNonArrayObservable ? modelValue.peek() : modelValue;
                  if (oldElemValue !== elemValue) {
                      // When we're responding to the checkedValue changing, and the element is
                      // currently checked, replace the old elem value with the new elem value
                      // in the model array.
                      if (isChecked) {
                          ko.utils.addOrRemoveItem(writableValue, elemValue, true);
                          ko.utils.addOrRemoveItem(writableValue, oldElemValue, false);
                      }
  
                      oldElemValue = elemValue;
                  } else {
                      // When we're responding to the user having checked/unchecked a checkbox,
                      // add/remove the element value to the model array.
                      ko.utils.addOrRemoveItem(writableValue, elemValue, isChecked);
                  }
                  if (rawValueIsNonArrayObservable && ko.isWriteableObservable(modelValue)) {
                      modelValue(writableValue);
                  }
              } else {
                  ko.expressionRewriting.writeValueToProperty(modelValue, allBindings, 'checked', elemValue, true);
              }
          };
  
          function updateView() {
              // This updates the view value from the model value.
              // It runs in response to changes in the bound (checked) value.
              var modelValue = ko.utils.unwrapObservable(valueAccessor());
  
              if (valueIsArray) {
                  // When a checkbox is bound to an array, being checked represents its value being present in that array
                  element.checked = ko.utils.arrayIndexOf(modelValue, checkedValue()) >= 0;
              } else if (isCheckbox) {
                  // When a checkbox is bound to any other value (not an array), being checked represents the value being trueish
                  element.checked = modelValue;
              } else {
                  // For radio buttons, being checked means that the radio button's value corresponds to the model value
                  element.checked = (checkedValue() === modelValue);
              }
          };
  
          var isCheckbox = element.type == "checkbox",
              isRadio = element.type == "radio";
  
          // Only bind to check boxes and radio buttons
          if (!isCheckbox && !isRadio) {
              return;
          }
  
          var rawValue = valueAccessor(),
              valueIsArray = isCheckbox && (ko.utils.unwrapObservable(rawValue) instanceof Array),
              rawValueIsNonArrayObservable = !(valueIsArray && rawValue.push && rawValue.splice),
              oldElemValue = valueIsArray ? checkedValue() : undefined,
              useCheckedValue = isRadio || valueIsArray;
  
          // IE 6 won't allow radio buttons to be selected unless they have a name
          if (isRadio && !element.name)
              ko.bindingHandlers['uniqueName']['init'](element, function() { return true });
  
          // Set up two computeds to update the binding:
  
          // The first responds to changes in the checkedValue value and to element clicks
          ko.computed(updateModel, null, { disposeWhenNodeIsRemoved: element });
          ko.utils.registerEventHandler(element, "click", updateModel);
  
          // The second responds to changes in the model value (the one associated with the checked binding)
          ko.computed(updateView, null, { disposeWhenNodeIsRemoved: element });
  
          rawValue = undefined;
      }
  };
  ko.expressionRewriting.twoWayBindings['checked'] = true;
  
  ko.bindingHandlers['checkedValue'] = {
      'update': function (element, valueAccessor) {
          element.value = ko.utils.unwrapObservable(valueAccessor());
      }
  };
  
  })();var classesWrittenByBindingKey = '__ko__cssValue';
  ko.bindingHandlers['css'] = {
      'update': function (element, valueAccessor) {
          var value = ko.utils.unwrapObservable(valueAccessor());
          if (value !== null && typeof value == "object") {
              ko.utils.objectForEach(value, function(className, shouldHaveClass) {
                  shouldHaveClass = ko.utils.unwrapObservable(shouldHaveClass);
                  ko.utils.toggleDomNodeCssClass(element, className, shouldHaveClass);
              });
          } else {
              value = ko.utils.stringTrim(String(value || '')); // Make sure we don't try to store or set a non-string value
              ko.utils.toggleDomNodeCssClass(element, element[classesWrittenByBindingKey], false);
              element[classesWrittenByBindingKey] = value;
              ko.utils.toggleDomNodeCssClass(element, value, true);
          }
      }
  };
  ko.bindingHandlers['enable'] = {
      'update': function (element, valueAccessor) {
          var value = ko.utils.unwrapObservable(valueAccessor());
          if (value && element.disabled)
              element.removeAttribute("disabled");
          else if ((!value) && (!element.disabled))
              element.disabled = true;
      }
  };
  
  ko.bindingHandlers['disable'] = {
      'update': function (element, valueAccessor) {
          ko.bindingHandlers['enable']['update'](element, function() { return !ko.utils.unwrapObservable(valueAccessor()) });
      }
  };
  // For certain common events (currently just 'click'), allow a simplified data-binding syntax
  // e.g. click:handler instead of the usual full-length event:{click:handler}
  function makeEventHandlerShortcut(eventName) {
      ko.bindingHandlers[eventName] = {
          'init': function(element, valueAccessor, allBindings, viewModel, bindingContext) {
              var newValueAccessor = function () {
                  var result = {};
                  result[eventName] = valueAccessor();
                  return result;
              };
              return ko.bindingHandlers['event']['init'].call(this, element, newValueAccessor, allBindings, viewModel, bindingContext);
          }
      }
  }
  
  ko.bindingHandlers['event'] = {
      'init' : function (element, valueAccessor, allBindings, viewModel, bindingContext) {
          var eventsToHandle = valueAccessor() || {};
          ko.utils.objectForEach(eventsToHandle, function(eventName) {
              if (typeof eventName == "string") {
                  ko.utils.registerEventHandler(element, eventName, function (event) {
                      var handlerReturnValue;
                      var handlerFunction = valueAccessor()[eventName];
                      if (!handlerFunction)
                          return;
  
                      try {
                          // Take all the event args, and prefix with the viewmodel
                          var argsForHandler = ko.utils.makeArray(arguments);
                          viewModel = bindingContext['$data'];
                          argsForHandler.unshift(viewModel);
                          handlerReturnValue = handlerFunction.apply(viewModel, argsForHandler);
                      } finally {
                          if (handlerReturnValue !== true) { // Normally we want to prevent default action. Developer can override this be explicitly returning true.
                              if (event.preventDefault)
                                  event.preventDefault();
                              else
                                  event.returnValue = false;
                          }
                      }
  
                      var bubble = allBindings.get(eventName + 'Bubble') !== false;
                      if (!bubble) {
                          event.cancelBubble = true;
                          if (event.stopPropagation)
                              event.stopPropagation();
                      }
                  });
              }
          });
      }
  };
  // "foreach: someExpression" is equivalent to "template: { foreach: someExpression }"
  // "foreach: { data: someExpression, afterAdd: myfn }" is equivalent to "template: { foreach: someExpression, afterAdd: myfn }"
  ko.bindingHandlers['foreach'] = {
      makeTemplateValueAccessor: function(valueAccessor) {
          return function() {
              var modelValue = valueAccessor(),
                  unwrappedValue = ko.utils.peekObservable(modelValue);    // Unwrap without setting a dependency here
  
              // If unwrappedValue is the array, pass in the wrapped value on its own
              // The value will be unwrapped and tracked within the template binding
              // (See https://github.com/SteveSanderson/knockout/issues/523)
              if ((!unwrappedValue) || typeof unwrappedValue.length == "number")
                  return { 'foreach': modelValue, 'templateEngine': ko.nativeTemplateEngine.instance };
  
              // If unwrappedValue.data is the array, preserve all relevant options and unwrap again value so we get updates
              ko.utils.unwrapObservable(modelValue);
              return {
                  'foreach': unwrappedValue['data'],
                  'as': unwrappedValue['as'],
                  'includeDestroyed': unwrappedValue['includeDestroyed'],
                  'afterAdd': unwrappedValue['afterAdd'],
                  'beforeRemove': unwrappedValue['beforeRemove'],
                  'afterRender': unwrappedValue['afterRender'],
                  'beforeMove': unwrappedValue['beforeMove'],
                  'afterMove': unwrappedValue['afterMove'],
                  'templateEngine': ko.nativeTemplateEngine.instance
              };
          };
      },
      'init': function(element, valueAccessor, allBindings, viewModel, bindingContext) {
          return ko.bindingHandlers['template']['init'](element, ko.bindingHandlers['foreach'].makeTemplateValueAccessor(valueAccessor));
      },
      'update': function(element, valueAccessor, allBindings, viewModel, bindingContext) {
          return ko.bindingHandlers['template']['update'](element, ko.bindingHandlers['foreach'].makeTemplateValueAccessor(valueAccessor), allBindings, viewModel, bindingContext);
      }
  };
  ko.expressionRewriting.bindingRewriteValidators['foreach'] = false; // Can't rewrite control flow bindings
  ko.virtualElements.allowedBindings['foreach'] = true;
  var hasfocusUpdatingProperty = '__ko_hasfocusUpdating';
  var hasfocusLastValue = '__ko_hasfocusLastValue';
  ko.bindingHandlers['hasfocus'] = {
      'init': function(element, valueAccessor, allBindings) {
          var handleElementFocusChange = function(isFocused) {
              // Where possible, ignore which event was raised and determine focus state using activeElement,
              // as this avoids phantom focus/blur events raised when changing tabs in modern browsers.
              // However, not all KO-targeted browsers (Firefox 2) support activeElement. For those browsers,
              // prevent a loss of focus when changing tabs/windows by setting a flag that prevents hasfocus
              // from calling 'blur()' on the element when it loses focus.
              // Discussion at https://github.com/SteveSanderson/knockout/pull/352
              element[hasfocusUpdatingProperty] = true;
              var ownerDoc = element.ownerDocument;
              if ("activeElement" in ownerDoc) {
                  var active;
                  try {
                      active = ownerDoc.activeElement;
                  } catch(e) {
                      // IE9 throws if you access activeElement during page load (see issue #703)
                      active = ownerDoc.body;
                  }
                  isFocused = (active === element);
              }
              var modelValue = valueAccessor();
              ko.expressionRewriting.writeValueToProperty(modelValue, allBindings, 'hasfocus', isFocused, true);
  
              //cache the latest value, so we can avoid unnecessarily calling focus/blur in the update function
              element[hasfocusLastValue] = isFocused;
              element[hasfocusUpdatingProperty] = false;
          };
          var handleElementFocusIn = handleElementFocusChange.bind(null, true);
          var handleElementFocusOut = handleElementFocusChange.bind(null, false);
  
          ko.utils.registerEventHandler(element, "focus", handleElementFocusIn);
          ko.utils.registerEventHandler(element, "focusin", handleElementFocusIn); // For IE
          ko.utils.registerEventHandler(element, "blur",  handleElementFocusOut);
          ko.utils.registerEventHandler(element, "focusout",  handleElementFocusOut); // For IE
      },
      'update': function(element, valueAccessor) {
          var value = !!ko.utils.unwrapObservable(valueAccessor());
  
          if (!element[hasfocusUpdatingProperty] && element[hasfocusLastValue] !== value) {
              value ? element.focus() : element.blur();
  
              // In IE, the blur method doesn't always cause the element to lose focus (for example, if the window is not in focus).
              // Setting focus to the body element does seem to be reliable in IE, but should only be used if we know that the current
              // element was focused already.
              if (!value && element[hasfocusLastValue]) {
                  element.ownerDocument.body.focus();
              }
  
              // For IE, which doesn't reliably fire "focus" or "blur" events synchronously
              ko.dependencyDetection.ignore(ko.utils.triggerEvent, null, [element, value ? "focusin" : "focusout"]);
          }
      }
  };
  ko.expressionRewriting.twoWayBindings['hasfocus'] = true;
  
  ko.bindingHandlers['hasFocus'] = ko.bindingHandlers['hasfocus']; // Make "hasFocus" an alias
  ko.expressionRewriting.twoWayBindings['hasFocus'] = true;
  ko.bindingHandlers['html'] = {
      'init': function() {
          // Prevent binding on the dynamically-injected HTML (as developers are unlikely to expect that, and it has security implications)
          return { 'controlsDescendantBindings': true };
      },
      'update': function (element, valueAccessor) {
          // setHtml will unwrap the value if needed
          ko.utils.setHtml(element, valueAccessor());
      }
  };
  // Makes a binding like with or if
  function makeWithIfBinding(bindingKey, isWith, isNot, makeContextCallback) {
      ko.bindingHandlers[bindingKey] = {
          'init': function(element, valueAccessor, allBindings, viewModel, bindingContext) {
              var didDisplayOnLastUpdate,
                  savedNodes;
              ko.computed(function() {
                  var rawValue = valueAccessor(),
                      dataValue = ko.utils.unwrapObservable(rawValue),
                      shouldDisplay = !isNot !== !dataValue, // equivalent to isNot ? !dataValue : !!dataValue
                      isFirstRender = !savedNodes,
                      needsRefresh = isFirstRender || isWith || (shouldDisplay !== didDisplayOnLastUpdate);
  
                  if (needsRefresh) {
                      // Save a copy of the inner nodes on the initial update, but only if we have dependencies.
                      if (isFirstRender && ko.computedContext.getDependenciesCount()) {
                          savedNodes = ko.utils.cloneNodes(ko.virtualElements.childNodes(element), true /* shouldCleanNodes */);
                      }
  
                      if (shouldDisplay) {
                          if (!isFirstRender) {
                              ko.virtualElements.setDomNodeChildren(element, ko.utils.cloneNodes(savedNodes));
                          }
                          ko.applyBindingsToDescendants(makeContextCallback ? makeContextCallback(bindingContext, rawValue) : bindingContext, element);
                      } else {
                          ko.virtualElements.emptyNode(element);
                      }
  
                      didDisplayOnLastUpdate = shouldDisplay;
                  }
              }, null, { disposeWhenNodeIsRemoved: element });
              return { 'controlsDescendantBindings': true };
          }
      };
      ko.expressionRewriting.bindingRewriteValidators[bindingKey] = false; // Can't rewrite control flow bindings
      ko.virtualElements.allowedBindings[bindingKey] = true;
  }
  
  // Construct the actual binding handlers
  makeWithIfBinding('if');
  makeWithIfBinding('ifnot', false /* isWith */, true /* isNot */);
  makeWithIfBinding('with', true /* isWith */, false /* isNot */,
      function(bindingContext, dataValue) {
          return bindingContext.createStaticChildContext(dataValue);
      }
  );
  var captionPlaceholder = {};
  ko.bindingHandlers['options'] = {
      'init': function(element) {
          if (ko.utils.tagNameLower(element) !== "select")
              throw new Error("options binding applies only to SELECT elements");
  
          // Remove all existing <option>s.
          while (element.length > 0) {
              element.remove(0);
          }
  
          // Ensures that the binding processor doesn't try to bind the options
          return { 'controlsDescendantBindings': true };
      },
      'update': function (element, valueAccessor, allBindings) {
          function selectedOptions() {
              return ko.utils.arrayFilter(element.options, function (node) { return node.selected; });
          }
  
          var selectWasPreviouslyEmpty = element.length == 0,
              multiple = element.multiple,
              previousScrollTop = (!selectWasPreviouslyEmpty && multiple) ? element.scrollTop : null,
              unwrappedArray = ko.utils.unwrapObservable(valueAccessor()),
              valueAllowUnset = allBindings.get('valueAllowUnset') && allBindings['has']('value'),
              includeDestroyed = allBindings.get('optionsIncludeDestroyed'),
              arrayToDomNodeChildrenOptions = {},
              captionValue,
              filteredArray,
              previousSelectedValues = [];
  
          if (!valueAllowUnset) {
              if (multiple) {
                  previousSelectedValues = ko.utils.arrayMap(selectedOptions(), ko.selectExtensions.readValue);
              } else if (element.selectedIndex >= 0) {
                  previousSelectedValues.push(ko.selectExtensions.readValue(element.options[element.selectedIndex]));
              }
          }
  
          if (unwrappedArray) {
              if (typeof unwrappedArray.length == "undefined") // Coerce single value into array
                  unwrappedArray = [unwrappedArray];
  
              // Filter out any entries marked as destroyed
              filteredArray = ko.utils.arrayFilter(unwrappedArray, function(item) {
                  return includeDestroyed || item === undefined || item === null || !ko.utils.unwrapObservable(item['_destroy']);
              });
  
              // If caption is included, add it to the array
              if (allBindings['has']('optionsCaption')) {
                  captionValue = ko.utils.unwrapObservable(allBindings.get('optionsCaption'));
                  // If caption value is null or undefined, don't show a caption
                  if (captionValue !== null && captionValue !== undefined) {
                      filteredArray.unshift(captionPlaceholder);
                  }
              }
          } else {
              // If a falsy value is provided (e.g. null), we'll simply empty the select element
          }
  
          function applyToObject(object, predicate, defaultValue) {
              var predicateType = typeof predicate;
              if (predicateType == "function")    // Given a function; run it against the data value
                  return predicate(object);
              else if (predicateType == "string") // Given a string; treat it as a property name on the data value
                  return object[predicate];
              else                                // Given no optionsText arg; use the data value itself
                  return defaultValue;
          }
  
          // The following functions can run at two different times:
          // The first is when the whole array is being updated directly from this binding handler.
          // The second is when an observable value for a specific array entry is updated.
          // oldOptions will be empty in the first case, but will be filled with the previously generated option in the second.
          var itemUpdate = false;
          function optionForArrayItem(arrayEntry, index, oldOptions) {
              if (oldOptions.length) {
                  previousSelectedValues = !valueAllowUnset && oldOptions[0].selected ? [ ko.selectExtensions.readValue(oldOptions[0]) ] : [];
                  itemUpdate = true;
              }
              var option = element.ownerDocument.createElement("option");
              if (arrayEntry === captionPlaceholder) {
                  ko.utils.setTextContent(option, allBindings.get('optionsCaption'));
                  ko.selectExtensions.writeValue(option, undefined);
              } else {
                  // Apply a value to the option element
                  var optionValue = applyToObject(arrayEntry, allBindings.get('optionsValue'), arrayEntry);
                  ko.selectExtensions.writeValue(option, ko.utils.unwrapObservable(optionValue));
  
                  // Apply some text to the option element
                  var optionText = applyToObject(arrayEntry, allBindings.get('optionsText'), optionValue);
                  ko.utils.setTextContent(option, optionText);
              }
              return [option];
          }
  
          // By using a beforeRemove callback, we delay the removal until after new items are added. This fixes a selection
          // problem in IE<=8 and Firefox. See https://github.com/knockout/knockout/issues/1208
          arrayToDomNodeChildrenOptions['beforeRemove'] =
              function (option) {
                  element.removeChild(option);
              };
  
          function setSelectionCallback(arrayEntry, newOptions) {
              if (itemUpdate && valueAllowUnset) {
                  // The model value is authoritative, so make sure its value is the one selected
                  // There is no need to use dependencyDetection.ignore since setDomNodeChildrenFromArrayMapping does so already.
                  ko.selectExtensions.writeValue(element, ko.utils.unwrapObservable(allBindings.get('value')), true /* allowUnset */);
              } else if (previousSelectedValues.length) {
                  // IE6 doesn't like us to assign selection to OPTION nodes before they're added to the document.
                  // That's why we first added them without selection. Now it's time to set the selection.
                  var isSelected = ko.utils.arrayIndexOf(previousSelectedValues, ko.selectExtensions.readValue(newOptions[0])) >= 0;
                  ko.utils.setOptionNodeSelectionState(newOptions[0], isSelected);
  
                  // If this option was changed from being selected during a single-item update, notify the change
                  if (itemUpdate && !isSelected) {
                      ko.dependencyDetection.ignore(ko.utils.triggerEvent, null, [element, "change"]);
                  }
              }
          }
  
          var callback = setSelectionCallback;
          if (allBindings['has']('optionsAfterRender') && typeof allBindings.get('optionsAfterRender') == "function") {
              callback = function(arrayEntry, newOptions) {
                  setSelectionCallback(arrayEntry, newOptions);
                  ko.dependencyDetection.ignore(allBindings.get('optionsAfterRender'), null, [newOptions[0], arrayEntry !== captionPlaceholder ? arrayEntry : undefined]);
              }
          }
  
          ko.utils.setDomNodeChildrenFromArrayMapping(element, filteredArray, optionForArrayItem, arrayToDomNodeChildrenOptions, callback);
  
          ko.dependencyDetection.ignore(function () {
              if (valueAllowUnset) {
                  // The model value is authoritative, so make sure its value is the one selected
                  ko.selectExtensions.writeValue(element, ko.utils.unwrapObservable(allBindings.get('value')), true /* allowUnset */);
              } else {
                  // Determine if the selection has changed as a result of updating the options list
                  var selectionChanged;
                  if (multiple) {
                      // For a multiple-select box, compare the new selection count to the previous one
                      // But if nothing was selected before, the selection can't have changed
                      selectionChanged = previousSelectedValues.length && selectedOptions().length < previousSelectedValues.length;
                  } else {
                      // For a single-select box, compare the current value to the previous value
                      // But if nothing was selected before or nothing is selected now, just look for a change in selection
                      selectionChanged = (previousSelectedValues.length && element.selectedIndex >= 0)
                          ? (ko.selectExtensions.readValue(element.options[element.selectedIndex]) !== previousSelectedValues[0])
                          : (previousSelectedValues.length || element.selectedIndex >= 0);
                  }
  
                  // Ensure consistency between model value and selected option.
                  // If the dropdown was changed so that selection is no longer the same,
                  // notify the value or selectedOptions binding.
                  if (selectionChanged) {
                      ko.utils.triggerEvent(element, "change");
                  }
              }
          });
  
          // Workaround for IE bug
          ko.utils.ensureSelectElementIsRenderedCorrectly(element);
  
          if (previousScrollTop && Math.abs(previousScrollTop - element.scrollTop) > 20)
              element.scrollTop = previousScrollTop;
      }
  };
  ko.bindingHandlers['options'].optionValueDomDataKey = ko.utils.domData.nextKey();
  ko.bindingHandlers['selectedOptions'] = {
      'after': ['options', 'foreach'],
      'init': function (element, valueAccessor, allBindings) {
          ko.utils.registerEventHandler(element, "change", function () {
              var value = valueAccessor(), valueToWrite = [];
              ko.utils.arrayForEach(element.getElementsByTagName("option"), function(node) {
                  if (node.selected)
                      valueToWrite.push(ko.selectExtensions.readValue(node));
              });
              ko.expressionRewriting.writeValueToProperty(value, allBindings, 'selectedOptions', valueToWrite);
          });
      },
      'update': function (element, valueAccessor) {
          if (ko.utils.tagNameLower(element) != "select")
              throw new Error("values binding applies only to SELECT elements");
  
          var newValue = ko.utils.unwrapObservable(valueAccessor()),
              previousScrollTop = element.scrollTop;
  
          if (newValue && typeof newValue.length == "number") {
              ko.utils.arrayForEach(element.getElementsByTagName("option"), function(node) {
                  var isSelected = ko.utils.arrayIndexOf(newValue, ko.selectExtensions.readValue(node)) >= 0;
                  if (node.selected != isSelected) {      // This check prevents flashing of the select element in IE
                      ko.utils.setOptionNodeSelectionState(node, isSelected);
                  }
              });
          }
  
          element.scrollTop = previousScrollTop;
      }
  };
  ko.expressionRewriting.twoWayBindings['selectedOptions'] = true;
  ko.bindingHandlers['style'] = {
      'update': function (element, valueAccessor) {
          var value = ko.utils.unwrapObservable(valueAccessor() || {});
          ko.utils.objectForEach(value, function(styleName, styleValue) {
              styleValue = ko.utils.unwrapObservable(styleValue);
  
              if (styleValue === null || styleValue === undefined || styleValue === false) {
                  // Empty string removes the value, whereas null/undefined have no effect
                  styleValue = "";
              }
  
              element.style[styleName] = styleValue;
          });
      }
  };
  ko.bindingHandlers['submit'] = {
      'init': function (element, valueAccessor, allBindings, viewModel, bindingContext) {
          if (typeof valueAccessor() != "function")
              throw new Error("The value for a submit binding must be a function");
          ko.utils.registerEventHandler(element, "submit", function (event) {
              var handlerReturnValue;
              var value = valueAccessor();
              try { handlerReturnValue = value.call(bindingContext['$data'], element); }
              finally {
                  if (handlerReturnValue !== true) { // Normally we want to prevent default action. Developer can override this be explicitly returning true.
                      if (event.preventDefault)
                          event.preventDefault();
                      else
                          event.returnValue = false;
                  }
              }
          });
      }
  };
  ko.bindingHandlers['text'] = {
      'init': function() {
          // Prevent binding on the dynamically-injected text node (as developers are unlikely to expect that, and it has security implications).
          // It should also make things faster, as we no longer have to consider whether the text node might be bindable.
          return { 'controlsDescendantBindings': true };
      },
      'update': function (element, valueAccessor) {
          ko.utils.setTextContent(element, valueAccessor());
      }
  };
  ko.virtualElements.allowedBindings['text'] = true;
  (function () {
  
  if (window && window.navigator) {
      var parseVersion = function (matches) {
          if (matches) {
              return parseFloat(matches[1]);
          }
      };
  
      // Detect various browser versions because some old versions don't fully support the 'input' event
      var operaVersion = window.opera && window.opera.version && parseInt(window.opera.version()),
          userAgent = window.navigator.userAgent,
          safariVersion = parseVersion(userAgent.match(/^(?:(?!chrome).)*version\/([^ ]*) safari/i)),
          firefoxVersion = parseVersion(userAgent.match(/Firefox\/([^ ]*)/));
  }
  
  // IE 8 and 9 have bugs that prevent the normal events from firing when the value changes.
  // But it does fire the 'selectionchange' event on many of those, presumably because the
  // cursor is moving and that counts as the selection changing. The 'selectionchange' event is
  // fired at the document level only and doesn't directly indicate which element changed. We
  // set up just one event handler for the document and use 'activeElement' to determine which
  // element was changed.
  if (ko.utils.ieVersion < 10) {
      var selectionChangeRegisteredName = ko.utils.domData.nextKey(),
          selectionChangeHandlerName = ko.utils.domData.nextKey();
      var selectionChangeHandler = function(event) {
          var target = this.activeElement,
              handler = target && ko.utils.domData.get(target, selectionChangeHandlerName);
          if (handler) {
              handler(event);
          }
      };
      var registerForSelectionChangeEvent = function (element, handler) {
          var ownerDoc = element.ownerDocument;
          if (!ko.utils.domData.get(ownerDoc, selectionChangeRegisteredName)) {
              ko.utils.domData.set(ownerDoc, selectionChangeRegisteredName, true);
              ko.utils.registerEventHandler(ownerDoc, 'selectionchange', selectionChangeHandler);
          }
          ko.utils.domData.set(element, selectionChangeHandlerName, handler);
      };
  }
  
  ko.bindingHandlers['textInput'] = {
      'init': function (element, valueAccessor, allBindings) {
  
          var previousElementValue = element.value,
              timeoutHandle,
              elementValueBeforeEvent;
  
          var updateModel = function (event) {
              clearTimeout(timeoutHandle);
              elementValueBeforeEvent = timeoutHandle = undefined;
  
              var elementValue = element.value;
              if (previousElementValue !== elementValue) {
                  // Provide a way for tests to know exactly which event was processed
                  if (DEBUG && event) element['_ko_textInputProcessedEvent'] = event.type;
                  previousElementValue = elementValue;
                  ko.expressionRewriting.writeValueToProperty(valueAccessor(), allBindings, 'textInput', elementValue);
              }
          };
  
          var deferUpdateModel = function (event) {
              if (!timeoutHandle) {
                  // The elementValueBeforeEvent variable is set *only* during the brief gap between an
                  // event firing and the updateModel function running. This allows us to ignore model
                  // updates that are from the previous state of the element, usually due to techniques
                  // such as rateLimit. Such updates, if not ignored, can cause keystrokes to be lost.
                  elementValueBeforeEvent = element.value;
                  var handler = DEBUG ? updateModel.bind(element, {type: event.type}) : updateModel;
                  timeoutHandle = ko.utils.setTimeout(handler, 4);
              }
          };
  
          // IE9 will mess up the DOM if you handle events synchronously which results in DOM changes (such as other bindings);
          // so we'll make sure all updates are asynchronous
          var ieUpdateModel = ko.utils.ieVersion == 9 ? deferUpdateModel : updateModel;
  
          var updateView = function () {
              var modelValue = ko.utils.unwrapObservable(valueAccessor());
  
              if (modelValue === null || modelValue === undefined) {
                  modelValue = '';
              }
  
              if (elementValueBeforeEvent !== undefined && modelValue === elementValueBeforeEvent) {
                  ko.utils.setTimeout(updateView, 4);
                  return;
              }
  
              // Update the element only if the element and model are different. On some browsers, updating the value
              // will move the cursor to the end of the input, which would be bad while the user is typing.
              if (element.value !== modelValue) {
                  previousElementValue = modelValue;  // Make sure we ignore events (propertychange) that result from updating the value
                  element.value = modelValue;
              }
          };
  
          var onEvent = function (event, handler) {
              ko.utils.registerEventHandler(element, event, handler);
          };
  
          if (DEBUG && ko.bindingHandlers['textInput']['_forceUpdateOn']) {
              // Provide a way for tests to specify exactly which events are bound
              ko.utils.arrayForEach(ko.bindingHandlers['textInput']['_forceUpdateOn'], function(eventName) {
                  if (eventName.slice(0,5) == 'after') {
                      onEvent(eventName.slice(5), deferUpdateModel);
                  } else {
                      onEvent(eventName, updateModel);
                  }
              });
          } else {
              if (ko.utils.ieVersion < 10) {
                  // Internet Explorer <= 8 doesn't support the 'input' event, but does include 'propertychange' that fires whenever
                  // any property of an element changes. Unlike 'input', it also fires if a property is changed from JavaScript code,
                  // but that's an acceptable compromise for this binding. IE 9 does support 'input', but since it doesn't fire it
                  // when using autocomplete, we'll use 'propertychange' for it also.
                  onEvent('propertychange', function(event) {
                      if (event.propertyName === 'value') {
                          ieUpdateModel(event);
                      }
                  });
  
                  if (ko.utils.ieVersion == 8) {
                      // IE 8 has a bug where it fails to fire 'propertychange' on the first update following a value change from
                      // JavaScript code. It also doesn't fire if you clear the entire value. To fix this, we bind to the following
                      // events too.
                      onEvent('keyup', updateModel);      // A single keystoke
                      onEvent('keydown', updateModel);    // The first character when a key is held down
                  }
                  if (ko.utils.ieVersion >= 8) {
                      // Internet Explorer 9 doesn't fire the 'input' event when deleting text, including using
                      // the backspace, delete, or ctrl-x keys, clicking the 'x' to clear the input, dragging text
                      // out of the field, and cutting or deleting text using the context menu. 'selectionchange'
                      // can detect all of those except dragging text out of the field, for which we use 'dragend'.
                      // These are also needed in IE8 because of the bug described above.
                      registerForSelectionChangeEvent(element, ieUpdateModel);  // 'selectionchange' covers cut, paste, drop, delete, etc.
                      onEvent('dragend', deferUpdateModel);
                  }
              } else {
                  // All other supported browsers support the 'input' event, which fires whenever the content of the element is changed
                  // through the user interface.
                  onEvent('input', updateModel);
  
                  if (safariVersion < 5 && ko.utils.tagNameLower(element) === "textarea") {
                      // Safari <5 doesn't fire the 'input' event for <textarea> elements (it does fire 'textInput'
                      // but only when typing). So we'll just catch as much as we can with keydown, cut, and paste.
                      onEvent('keydown', deferUpdateModel);
                      onEvent('paste', deferUpdateModel);
                      onEvent('cut', deferUpdateModel);
                  } else if (operaVersion < 11) {
                      // Opera 10 doesn't always fire the 'input' event for cut, paste, undo & drop operations.
                      // We can try to catch some of those using 'keydown'.
                      onEvent('keydown', deferUpdateModel);
                  } else if (firefoxVersion < 4.0) {
                      // Firefox <= 3.6 doesn't fire the 'input' event when text is filled in through autocomplete
                      onEvent('DOMAutoComplete', updateModel);
  
                      // Firefox <=3.5 doesn't fire the 'input' event when text is dropped into the input.
                      onEvent('dragdrop', updateModel);       // <3.5
                      onEvent('drop', updateModel);           // 3.5
                  }
              }
          }
  
          // Bind to the change event so that we can catch programmatic updates of the value that fire this event.
          onEvent('change', updateModel);
  
          ko.computed(updateView, null, { disposeWhenNodeIsRemoved: element });
      }
  };
  ko.expressionRewriting.twoWayBindings['textInput'] = true;
  
  // textinput is an alias for textInput
  ko.bindingHandlers['textinput'] = {
      // preprocess is the only way to set up a full alias
      'preprocess': function (value, name, addBinding) {
          addBinding('textInput', value);
      }
  };
  
  })();ko.bindingHandlers['uniqueName'] = {
      'init': function (element, valueAccessor) {
          if (valueAccessor()) {
              var name = "ko_unique_" + (++ko.bindingHandlers['uniqueName'].currentIndex);
              ko.utils.setElementName(element, name);
          }
      }
  };
  ko.bindingHandlers['uniqueName'].currentIndex = 0;
  ko.bindingHandlers['value'] = {
      'after': ['options', 'foreach'],
      'init': function (element, valueAccessor, allBindings) {
          // If the value binding is placed on a radio/checkbox, then just pass through to checkedValue and quit
          if (element.tagName.toLowerCase() == "input" && (element.type == "checkbox" || element.type == "radio")) {
              ko.applyBindingAccessorsToNode(element, { 'checkedValue': valueAccessor });
              return;
          }
  
          // Always catch "change" event; possibly other events too if asked
          var eventsToCatch = ["change"];
          var requestedEventsToCatch = allBindings.get("valueUpdate");
          var propertyChangedFired = false;
          var elementValueBeforeEvent = null;
  
          if (requestedEventsToCatch) {
              if (typeof requestedEventsToCatch == "string") // Allow both individual event names, and arrays of event names
                  requestedEventsToCatch = [requestedEventsToCatch];
              ko.utils.arrayPushAll(eventsToCatch, requestedEventsToCatch);
              eventsToCatch = ko.utils.arrayGetDistinctValues(eventsToCatch);
          }
  
          var valueUpdateHandler = function() {
              elementValueBeforeEvent = null;
              propertyChangedFired = false;
              var modelValue = valueAccessor();
              var elementValue = ko.selectExtensions.readValue(element);
              ko.expressionRewriting.writeValueToProperty(modelValue, allBindings, 'value', elementValue);
          }
  
          // Workaround for https://github.com/SteveSanderson/knockout/issues/122
          // IE doesn't fire "change" events on textboxes if the user selects a value from its autocomplete list
          var ieAutoCompleteHackNeeded = ko.utils.ieVersion && element.tagName.toLowerCase() == "input" && element.type == "text"
                                         && element.autocomplete != "off" && (!element.form || element.form.autocomplete != "off");
          if (ieAutoCompleteHackNeeded && ko.utils.arrayIndexOf(eventsToCatch, "propertychange") == -1) {
              ko.utils.registerEventHandler(element, "propertychange", function () { propertyChangedFired = true });
              ko.utils.registerEventHandler(element, "focus", function () { propertyChangedFired = false });
              ko.utils.registerEventHandler(element, "blur", function() {
                  if (propertyChangedFired) {
                      valueUpdateHandler();
                  }
              });
          }
  
          ko.utils.arrayForEach(eventsToCatch, function(eventName) {
              // The syntax "after<eventname>" means "run the handler asynchronously after the event"
              // This is useful, for example, to catch "keydown" events after the browser has updated the control
              // (otherwise, ko.selectExtensions.readValue(this) will receive the control's value *before* the key event)
              var handler = valueUpdateHandler;
              if (ko.utils.stringStartsWith(eventName, "after")) {
                  handler = function() {
                      // The elementValueBeforeEvent variable is non-null *only* during the brief gap between
                      // a keyX event firing and the valueUpdateHandler running, which is scheduled to happen
                      // at the earliest asynchronous opportunity. We store this temporary information so that
                      // if, between keyX and valueUpdateHandler, the underlying model value changes separately,
                      // we can overwrite that model value change with the value the user just typed. Otherwise,
                      // techniques like rateLimit can trigger model changes at critical moments that will
                      // override the user's inputs, causing keystrokes to be lost.
                      elementValueBeforeEvent = ko.selectExtensions.readValue(element);
                      ko.utils.setTimeout(valueUpdateHandler, 0);
                  };
                  eventName = eventName.substring("after".length);
              }
              ko.utils.registerEventHandler(element, eventName, handler);
          });
  
          var updateFromModel = function () {
              var newValue = ko.utils.unwrapObservable(valueAccessor());
              var elementValue = ko.selectExtensions.readValue(element);
  
              if (elementValueBeforeEvent !== null && newValue === elementValueBeforeEvent) {
                  ko.utils.setTimeout(updateFromModel, 0);
                  return;
              }
  
              var valueHasChanged = (newValue !== elementValue);
  
              if (valueHasChanged) {
                  if (ko.utils.tagNameLower(element) === "select") {
                      var allowUnset = allBindings.get('valueAllowUnset');
                      var applyValueAction = function () {
                          ko.selectExtensions.writeValue(element, newValue, allowUnset);
                      };
                      applyValueAction();
  
                      if (!allowUnset && newValue !== ko.selectExtensions.readValue(element)) {
                          // If you try to set a model value that can't be represented in an already-populated dropdown, reject that change,
                          // because you're not allowed to have a model value that disagrees with a visible UI selection.
                          ko.dependencyDetection.ignore(ko.utils.triggerEvent, null, [element, "change"]);
                      } else {
                          // Workaround for IE6 bug: It won't reliably apply values to SELECT nodes during the same execution thread
                          // right after you've changed the set of OPTION nodes on it. So for that node type, we'll schedule a second thread
                          // to apply the value as well.
                          ko.utils.setTimeout(applyValueAction, 0);
                      }
                  } else {
                      ko.selectExtensions.writeValue(element, newValue);
                  }
              }
          };
  
          ko.computed(updateFromModel, null, { disposeWhenNodeIsRemoved: element });
      },
      'update': function() {} // Keep for backwards compatibility with code that may have wrapped value binding
  };
  ko.expressionRewriting.twoWayBindings['value'] = true;
  ko.bindingHandlers['visible'] = {
      'update': function (element, valueAccessor) {
          var value = ko.utils.unwrapObservable(valueAccessor());
          var isCurrentlyVisible = !(element.style.display == "none");
          if (value && !isCurrentlyVisible)
              element.style.display = "";
          else if ((!value) && isCurrentlyVisible)
              element.style.display = "none";
      }
  };
  // 'click' is just a shorthand for the usual full-length event:{click:handler}
  makeEventHandlerShortcut('click');
  // If you want to make a custom template engine,
  //
  // [1] Inherit from this class (like ko.nativeTemplateEngine does)
  // [2] Override 'renderTemplateSource', supplying a function with this signature:
  //
  //        function (templateSource, bindingContext, options) {
  //            // - templateSource.text() is the text of the template you should render
  //            // - bindingContext.$data is the data you should pass into the template
  //            //   - you might also want to make bindingContext.$parent, bindingContext.$parents,
  //            //     and bindingContext.$root available in the template too
  //            // - options gives you access to any other properties set on "data-bind: { template: options }"
  //            // - templateDocument is the document object of the template
  //            //
  //            // Return value: an array of DOM nodes
  //        }
  //
  // [3] Override 'createJavaScriptEvaluatorBlock', supplying a function with this signature:
  //
  //        function (script) {
  //            // Return value: Whatever syntax means "Evaluate the JavaScript statement 'script' and output the result"
  //            //               For example, the jquery.tmpl template engine converts 'someScript' to '${ someScript }'
  //        }
  //
  //     This is only necessary if you want to allow data-bind attributes to reference arbitrary template variables.
  //     If you don't want to allow that, you can set the property 'allowTemplateRewriting' to false (like ko.nativeTemplateEngine does)
  //     and then you don't need to override 'createJavaScriptEvaluatorBlock'.
  
  ko.templateEngine = function () { };
  
  ko.templateEngine.prototype['renderTemplateSource'] = function (templateSource, bindingContext, options, templateDocument) {
      throw new Error("Override renderTemplateSource");
  };
  
  ko.templateEngine.prototype['createJavaScriptEvaluatorBlock'] = function (script) {
      throw new Error("Override createJavaScriptEvaluatorBlock");
  };
  
  ko.templateEngine.prototype['makeTemplateSource'] = function(template, templateDocument) {
      // Named template
      if (typeof template == "string") {
          templateDocument = templateDocument || document;
          var elem = templateDocument.getElementById(template);
          if (!elem)
              throw new Error("Cannot find template with ID " + template);
          return new ko.templateSources.domElement(elem);
      } else if ((template.nodeType == 1) || (template.nodeType == 8)) {
          // Anonymous template
          return new ko.templateSources.anonymousTemplate(template);
      } else
          throw new Error("Unknown template type: " + template);
  };
  
  ko.templateEngine.prototype['renderTemplate'] = function (template, bindingContext, options, templateDocument) {
      var templateSource = this['makeTemplateSource'](template, templateDocument);
      return this['renderTemplateSource'](templateSource, bindingContext, options, templateDocument);
  };
  
  ko.templateEngine.prototype['isTemplateRewritten'] = function (template, templateDocument) {
      // Skip rewriting if requested
      if (this['allowTemplateRewriting'] === false)
          return true;
      return this['makeTemplateSource'](template, templateDocument)['data']("isRewritten");
  };
  
  ko.templateEngine.prototype['rewriteTemplate'] = function (template, rewriterCallback, templateDocument) {
      var templateSource = this['makeTemplateSource'](template, templateDocument);
      var rewritten = rewriterCallback(templateSource['text']());
      templateSource['text'](rewritten);
      templateSource['data']("isRewritten", true);
  };
  
  ko.exportSymbol('templateEngine', ko.templateEngine);
  
  ko.templateRewriting = (function () {
      var memoizeDataBindingAttributeSyntaxRegex = /(<([a-z]+\d*)(?:\s+(?!data-bind\s*=\s*)[a-z0-9\-]+(?:=(?:\"[^\"]*\"|\'[^\']*\'|[^>]*))?)*\s+)data-bind\s*=\s*(["'])([\s\S]*?)\3/gi;
      var memoizeVirtualContainerBindingSyntaxRegex = /<!--\s*ko\b\s*([\s\S]*?)\s*-->/g;
  
      function validateDataBindValuesForRewriting(keyValueArray) {
          var allValidators = ko.expressionRewriting.bindingRewriteValidators;
          for (var i = 0; i < keyValueArray.length; i++) {
              var key = keyValueArray[i]['key'];
              if (allValidators.hasOwnProperty(key)) {
                  var validator = allValidators[key];
  
                  if (typeof validator === "function") {
                      var possibleErrorMessage = validator(keyValueArray[i]['value']);
                      if (possibleErrorMessage)
                          throw new Error(possibleErrorMessage);
                  } else if (!validator) {
                      throw new Error("This template engine does not support the '" + key + "' binding within its templates");
                  }
              }
          }
      }
  
      function constructMemoizedTagReplacement(dataBindAttributeValue, tagToRetain, nodeName, templateEngine) {
          var dataBindKeyValueArray = ko.expressionRewriting.parseObjectLiteral(dataBindAttributeValue);
          validateDataBindValuesForRewriting(dataBindKeyValueArray);
          var rewrittenDataBindAttributeValue = ko.expressionRewriting.preProcessBindings(dataBindKeyValueArray, {'valueAccessors':true});
  
          // For no obvious reason, Opera fails to evaluate rewrittenDataBindAttributeValue unless it's wrapped in an additional
          // anonymous function, even though Opera's built-in debugger can evaluate it anyway. No other browser requires this
          // extra indirection.
          var applyBindingsToNextSiblingScript =
              "ko.__tr_ambtns(function($context,$element){return(function(){return{ " + rewrittenDataBindAttributeValue + " } })()},'" + nodeName.toLowerCase() + "')";
          return templateEngine['createJavaScriptEvaluatorBlock'](applyBindingsToNextSiblingScript) + tagToRetain;
      }
  
      return {
          ensureTemplateIsRewritten: function (template, templateEngine, templateDocument) {
              if (!templateEngine['isTemplateRewritten'](template, templateDocument))
                  templateEngine['rewriteTemplate'](template, function (htmlString) {
                      return ko.templateRewriting.memoizeBindingAttributeSyntax(htmlString, templateEngine);
                  }, templateDocument);
          },
  
          memoizeBindingAttributeSyntax: function (htmlString, templateEngine) {
              return htmlString.replace(memoizeDataBindingAttributeSyntaxRegex, function () {
                  return constructMemoizedTagReplacement(/* dataBindAttributeValue: */ arguments[4], /* tagToRetain: */ arguments[1], /* nodeName: */ arguments[2], templateEngine);
              }).replace(memoizeVirtualContainerBindingSyntaxRegex, function() {
                  return constructMemoizedTagReplacement(/* dataBindAttributeValue: */ arguments[1], /* tagToRetain: */ "<!-- ko -->", /* nodeName: */ "#comment", templateEngine);
              });
          },
  
          applyMemoizedBindingsToNextSibling: function (bindings, nodeName) {
              return ko.memoization.memoize(function (domNode, bindingContext) {
                  var nodeToBind = domNode.nextSibling;
                  if (nodeToBind && nodeToBind.nodeName.toLowerCase() === nodeName) {
                      ko.applyBindingAccessorsToNode(nodeToBind, bindings, bindingContext);
                  }
              });
          }
      }
  })();
  
  
  // Exported only because it has to be referenced by string lookup from within rewritten template
  ko.exportSymbol('__tr_ambtns', ko.templateRewriting.applyMemoizedBindingsToNextSibling);
  (function() {
      // A template source represents a read/write way of accessing a template. This is to eliminate the need for template loading/saving
      // logic to be duplicated in every template engine (and means they can all work with anonymous templates, etc.)
      //
      // Two are provided by default:
      //  1. ko.templateSources.domElement       - reads/writes the text content of an arbitrary DOM element
      //  2. ko.templateSources.anonymousElement - uses ko.utils.domData to read/write text *associated* with the DOM element, but
      //                                           without reading/writing the actual element text content, since it will be overwritten
      //                                           with the rendered template output.
      // You can implement your own template source if you want to fetch/store templates somewhere other than in DOM elements.
      // Template sources need to have the following functions:
      //   text() 			- returns the template text from your storage location
      //   text(value)		- writes the supplied template text to your storage location
      //   data(key)			- reads values stored using data(key, value) - see below
      //   data(key, value)	- associates "value" with this template and the key "key". Is used to store information like "isRewritten".
      //
      // Optionally, template sources can also have the following functions:
      //   nodes()            - returns a DOM element containing the nodes of this template, where available
      //   nodes(value)       - writes the given DOM element to your storage location
      // If a DOM element is available for a given template source, template engines are encouraged to use it in preference over text()
      // for improved speed. However, all templateSources must supply text() even if they don't supply nodes().
      //
      // Once you've implemented a templateSource, make your template engine use it by subclassing whatever template engine you were
      // using and overriding "makeTemplateSource" to return an instance of your custom template source.
  
      ko.templateSources = {};
  
      // ---- ko.templateSources.domElement -----
  
      // template types
      var templateScript = 1,
          templateTextArea = 2,
          templateTemplate = 3,
          templateElement = 4;
  
      ko.templateSources.domElement = function(element) {
          this.domElement = element;
  
          if (element) {
              var tagNameLower = ko.utils.tagNameLower(element);
              this.templateType =
                  tagNameLower === "script" ? templateScript :
                  tagNameLower === "textarea" ? templateTextArea :
                      // For browsers with proper <template> element support, where the .content property gives a document fragment
                  tagNameLower == "template" && element.content && element.content.nodeType === 11 ? templateTemplate :
                  templateElement;
          }
      }
  
      ko.templateSources.domElement.prototype['text'] = function(/* valueToWrite */) {
          var elemContentsProperty = this.templateType === templateScript ? "text"
                                   : this.templateType === templateTextArea ? "value"
                                   : "innerHTML";
  
          if (arguments.length == 0) {
              return this.domElement[elemContentsProperty];
          } else {
              var valueToWrite = arguments[0];
              if (elemContentsProperty === "innerHTML")
                  ko.utils.setHtml(this.domElement, valueToWrite);
              else
                  this.domElement[elemContentsProperty] = valueToWrite;
          }
      };
  
      var dataDomDataPrefix = ko.utils.domData.nextKey() + "_";
      ko.templateSources.domElement.prototype['data'] = function(key /*, valueToWrite */) {
          if (arguments.length === 1) {
              return ko.utils.domData.get(this.domElement, dataDomDataPrefix + key);
          } else {
              ko.utils.domData.set(this.domElement, dataDomDataPrefix + key, arguments[1]);
          }
      };
  
      var templatesDomDataKey = ko.utils.domData.nextKey();
      function getTemplateDomData(element) {
          return ko.utils.domData.get(element, templatesDomDataKey) || {};
      }
      function setTemplateDomData(element, data) {
          ko.utils.domData.set(element, templatesDomDataKey, data);
      }
  
      ko.templateSources.domElement.prototype['nodes'] = function(/* valueToWrite */) {
          var element = this.domElement;
          if (arguments.length == 0) {
              var templateData = getTemplateDomData(element),
                  containerData = templateData.containerData;
              return containerData || (
                  this.templateType === templateTemplate ? element.content :
                  this.templateType === templateElement ? element :
                  undefined);
          } else {
              var valueToWrite = arguments[0];
              setTemplateDomData(element, {containerData: valueToWrite});
          }
      };
  
      // ---- ko.templateSources.anonymousTemplate -----
      // Anonymous templates are normally saved/retrieved as DOM nodes through "nodes".
      // For compatibility, you can also read "text"; it will be serialized from the nodes on demand.
      // Writing to "text" is still supported, but then the template data will not be available as DOM nodes.
  
      ko.templateSources.anonymousTemplate = function(element) {
          this.domElement = element;
      }
      ko.templateSources.anonymousTemplate.prototype = new ko.templateSources.domElement();
      ko.templateSources.anonymousTemplate.prototype.constructor = ko.templateSources.anonymousTemplate;
      ko.templateSources.anonymousTemplate.prototype['text'] = function(/* valueToWrite */) {
          if (arguments.length == 0) {
              var templateData = getTemplateDomData(this.domElement);
              if (templateData.textData === undefined && templateData.containerData)
                  templateData.textData = templateData.containerData.innerHTML;
              return templateData.textData;
          } else {
              var valueToWrite = arguments[0];
              setTemplateDomData(this.domElement, {textData: valueToWrite});
          }
      };
  
      ko.exportSymbol('templateSources', ko.templateSources);
      ko.exportSymbol('templateSources.domElement', ko.templateSources.domElement);
      ko.exportSymbol('templateSources.anonymousTemplate', ko.templateSources.anonymousTemplate);
  })();
  (function () {
      var _templateEngine;
      ko.setTemplateEngine = function (templateEngine) {
          if ((templateEngine != undefined) && !(templateEngine instanceof ko.templateEngine))
              throw new Error("templateEngine must inherit from ko.templateEngine");
          _templateEngine = templateEngine;
      }
  
      function invokeForEachNodeInContinuousRange(firstNode, lastNode, action) {
          var node, nextInQueue = firstNode, firstOutOfRangeNode = ko.virtualElements.nextSibling(lastNode);
          while (nextInQueue && ((node = nextInQueue) !== firstOutOfRangeNode)) {
              nextInQueue = ko.virtualElements.nextSibling(node);
              action(node, nextInQueue);
          }
      }
  
      function activateBindingsOnContinuousNodeArray(continuousNodeArray, bindingContext) {
          // To be used on any nodes that have been rendered by a template and have been inserted into some parent element
          // Walks through continuousNodeArray (which *must* be continuous, i.e., an uninterrupted sequence of sibling nodes, because
          // the algorithm for walking them relies on this), and for each top-level item in the virtual-element sense,
          // (1) Does a regular "applyBindings" to associate bindingContext with this node and to activate any non-memoized bindings
          // (2) Unmemoizes any memos in the DOM subtree (e.g., to activate bindings that had been memoized during template rewriting)
  
          if (continuousNodeArray.length) {
              var firstNode = continuousNodeArray[0],
                  lastNode = continuousNodeArray[continuousNodeArray.length - 1],
                  parentNode = firstNode.parentNode,
                  provider = ko.bindingProvider['instance'],
                  preprocessNode = provider['preprocessNode'];
  
              if (preprocessNode) {
                  invokeForEachNodeInContinuousRange(firstNode, lastNode, function(node, nextNodeInRange) {
                      var nodePreviousSibling = node.previousSibling;
                      var newNodes = preprocessNode.call(provider, node);
                      if (newNodes) {
                          if (node === firstNode)
                              firstNode = newNodes[0] || nextNodeInRange;
                          if (node === lastNode)
                              lastNode = newNodes[newNodes.length - 1] || nodePreviousSibling;
                      }
                  });
  
                  // Because preprocessNode can change the nodes, including the first and last nodes, update continuousNodeArray to match.
                  // We need the full set, including inner nodes, because the unmemoize step might remove the first node (and so the real
                  // first node needs to be in the array).
                  continuousNodeArray.length = 0;
                  if (!firstNode) { // preprocessNode might have removed all the nodes, in which case there's nothing left to do
                      return;
                  }
                  if (firstNode === lastNode) {
                      continuousNodeArray.push(firstNode);
                  } else {
                      continuousNodeArray.push(firstNode, lastNode);
                      ko.utils.fixUpContinuousNodeArray(continuousNodeArray, parentNode);
                  }
              }
  
              // Need to applyBindings *before* unmemoziation, because unmemoization might introduce extra nodes (that we don't want to re-bind)
              // whereas a regular applyBindings won't introduce new memoized nodes
              invokeForEachNodeInContinuousRange(firstNode, lastNode, function(node) {
                  if (node.nodeType === 1 || node.nodeType === 8)
                      ko.applyBindings(bindingContext, node);
              });
              invokeForEachNodeInContinuousRange(firstNode, lastNode, function(node) {
                  if (node.nodeType === 1 || node.nodeType === 8)
                      ko.memoization.unmemoizeDomNodeAndDescendants(node, [bindingContext]);
              });
  
              // Make sure any changes done by applyBindings or unmemoize are reflected in the array
              ko.utils.fixUpContinuousNodeArray(continuousNodeArray, parentNode);
          }
      }
  
      function getFirstNodeFromPossibleArray(nodeOrNodeArray) {
          return nodeOrNodeArray.nodeType ? nodeOrNodeArray
                                          : nodeOrNodeArray.length > 0 ? nodeOrNodeArray[0]
                                          : null;
      }
  
      function executeTemplate(targetNodeOrNodeArray, renderMode, template, bindingContext, options) {
          options = options || {};
          var firstTargetNode = targetNodeOrNodeArray && getFirstNodeFromPossibleArray(targetNodeOrNodeArray);
          var templateDocument = (firstTargetNode || template || {}).ownerDocument;
          var templateEngineToUse = (options['templateEngine'] || _templateEngine);
          ko.templateRewriting.ensureTemplateIsRewritten(template, templateEngineToUse, templateDocument);
          var renderedNodesArray = templateEngineToUse['renderTemplate'](template, bindingContext, options, templateDocument);
  
          // Loosely check result is an array of DOM nodes
          if ((typeof renderedNodesArray.length != "number") || (renderedNodesArray.length > 0 && typeof renderedNodesArray[0].nodeType != "number"))
              throw new Error("Template engine must return an array of DOM nodes");
  
          var haveAddedNodesToParent = false;
          switch (renderMode) {
              case "replaceChildren":
                  ko.virtualElements.setDomNodeChildren(targetNodeOrNodeArray, renderedNodesArray);
                  haveAddedNodesToParent = true;
                  break;
              case "replaceNode":
                  ko.utils.replaceDomNodes(targetNodeOrNodeArray, renderedNodesArray);
                  haveAddedNodesToParent = true;
                  break;
              case "ignoreTargetNode": break;
              default:
                  throw new Error("Unknown renderMode: " + renderMode);
          }
  
          if (haveAddedNodesToParent) {
              activateBindingsOnContinuousNodeArray(renderedNodesArray, bindingContext);
              if (options['afterRender'])
                  ko.dependencyDetection.ignore(options['afterRender'], null, [renderedNodesArray, bindingContext['$data']]);
          }
  
          return renderedNodesArray;
      }
  
      function resolveTemplateName(template, data, context) {
          // The template can be specified as:
          if (ko.isObservable(template)) {
              // 1. An observable, with string value
              return template();
          } else if (typeof template === 'function') {
              // 2. A function of (data, context) returning a string
              return template(data, context);
          } else {
              // 3. A string
              return template;
          }
      }
  
      ko.renderTemplate = function (template, dataOrBindingContext, options, targetNodeOrNodeArray, renderMode) {
          options = options || {};
          if ((options['templateEngine'] || _templateEngine) == undefined)
              throw new Error("Set a template engine before calling renderTemplate");
          renderMode = renderMode || "replaceChildren";
  
          if (targetNodeOrNodeArray) {
              var firstTargetNode = getFirstNodeFromPossibleArray(targetNodeOrNodeArray);
  
              var whenToDispose = function () { return (!firstTargetNode) || !ko.utils.domNodeIsAttachedToDocument(firstTargetNode); }; // Passive disposal (on next evaluation)
              var activelyDisposeWhenNodeIsRemoved = (firstTargetNode && renderMode == "replaceNode") ? firstTargetNode.parentNode : firstTargetNode;
  
              return ko.dependentObservable( // So the DOM is automatically updated when any dependency changes
                  function () {
                      // Ensure we've got a proper binding context to work with
                      var bindingContext = (dataOrBindingContext && (dataOrBindingContext instanceof ko.bindingContext))
                          ? dataOrBindingContext
                          : new ko.bindingContext(dataOrBindingContext, null, null, null, { "exportDependencies": true });
  
                      var templateName = resolveTemplateName(template, bindingContext['$data'], bindingContext),
                          renderedNodesArray = executeTemplate(targetNodeOrNodeArray, renderMode, templateName, bindingContext, options);
  
                      if (renderMode == "replaceNode") {
                          targetNodeOrNodeArray = renderedNodesArray;
                          firstTargetNode = getFirstNodeFromPossibleArray(targetNodeOrNodeArray);
                      }
                  },
                  null,
                  { disposeWhen: whenToDispose, disposeWhenNodeIsRemoved: activelyDisposeWhenNodeIsRemoved }
              );
          } else {
              // We don't yet have a DOM node to evaluate, so use a memo and render the template later when there is a DOM node
              return ko.memoization.memoize(function (domNode) {
                  ko.renderTemplate(template, dataOrBindingContext, options, domNode, "replaceNode");
              });
          }
      };
  
      ko.renderTemplateForEach = function (template, arrayOrObservableArray, options, targetNode, parentBindingContext) {
          // Since setDomNodeChildrenFromArrayMapping always calls executeTemplateForArrayItem and then
          // activateBindingsCallback for added items, we can store the binding context in the former to use in the latter.
          var arrayItemContext;
  
          // This will be called by setDomNodeChildrenFromArrayMapping to get the nodes to add to targetNode
          var executeTemplateForArrayItem = function (arrayValue, index) {
              // Support selecting template as a function of the data being rendered
              arrayItemContext = parentBindingContext['createChildContext'](arrayValue, options['as'], function(context) {
                  context['$index'] = index;
              });
  
              var templateName = resolveTemplateName(template, arrayValue, arrayItemContext);
              return executeTemplate(null, "ignoreTargetNode", templateName, arrayItemContext, options);
          }
  
          // This will be called whenever setDomNodeChildrenFromArrayMapping has added nodes to targetNode
          var activateBindingsCallback = function(arrayValue, addedNodesArray, index) {
              activateBindingsOnContinuousNodeArray(addedNodesArray, arrayItemContext);
              if (options['afterRender'])
                  options['afterRender'](addedNodesArray, arrayValue);
  
              // release the "cache" variable, so that it can be collected by
              // the GC when its value isn't used from within the bindings anymore.
              arrayItemContext = null;
          };
  
          return ko.dependentObservable(function () {
              var unwrappedArray = ko.utils.unwrapObservable(arrayOrObservableArray) || [];
              if (typeof unwrappedArray.length == "undefined") // Coerce single value into array
                  unwrappedArray = [unwrappedArray];
  
              // Filter out any entries marked as destroyed
              var filteredArray = ko.utils.arrayFilter(unwrappedArray, function(item) {
                  return options['includeDestroyed'] || item === undefined || item === null || !ko.utils.unwrapObservable(item['_destroy']);
              });
  
              // Call setDomNodeChildrenFromArrayMapping, ignoring any observables unwrapped within (most likely from a callback function).
              // If the array items are observables, though, they will be unwrapped in executeTemplateForArrayItem and managed within setDomNodeChildrenFromArrayMapping.
              ko.dependencyDetection.ignore(ko.utils.setDomNodeChildrenFromArrayMapping, null, [targetNode, filteredArray, executeTemplateForArrayItem, options, activateBindingsCallback]);
  
          }, null, { disposeWhenNodeIsRemoved: targetNode });
      };
  
      var templateComputedDomDataKey = ko.utils.domData.nextKey();
      function disposeOldComputedAndStoreNewOne(element, newComputed) {
          var oldComputed = ko.utils.domData.get(element, templateComputedDomDataKey);
          if (oldComputed && (typeof(oldComputed.dispose) == 'function'))
              oldComputed.dispose();
          ko.utils.domData.set(element, templateComputedDomDataKey, (newComputed && newComputed.isActive()) ? newComputed : undefined);
      }
  
      ko.bindingHandlers['template'] = {
          'init': function(element, valueAccessor) {
              // Support anonymous templates
              var bindingValue = ko.utils.unwrapObservable(valueAccessor());
              if (typeof bindingValue == "string" || bindingValue['name']) {
                  // It's a named template - clear the element
                  ko.virtualElements.emptyNode(element);
              } else if ('nodes' in bindingValue) {
                  // We've been given an array of DOM nodes. Save them as the template source.
                  // There is no known use case for the node array being an observable array (if the output
                  // varies, put that behavior *into* your template - that's what templates are for), and
                  // the implementation would be a mess, so assert that it's not observable.
                  var nodes = bindingValue['nodes'] || [];
                  if (ko.isObservable(nodes)) {
                      throw new Error('The "nodes" option must be a plain, non-observable array.');
                  }
                  var container = ko.utils.moveCleanedNodesToContainerElement(nodes); // This also removes the nodes from their current parent
                  new ko.templateSources.anonymousTemplate(element)['nodes'](container);
              } else {
                  // It's an anonymous template - store the element contents, then clear the element
                  var templateNodes = ko.virtualElements.childNodes(element),
                      container = ko.utils.moveCleanedNodesToContainerElement(templateNodes); // This also removes the nodes from their current parent
                  new ko.templateSources.anonymousTemplate(element)['nodes'](container);
              }
              return { 'controlsDescendantBindings': true };
          },
          'update': function (element, valueAccessor, allBindings, viewModel, bindingContext) {
              var value = valueAccessor(),
                  options = ko.utils.unwrapObservable(value),
                  shouldDisplay = true,
                  templateComputed = null,
                  templateName;
  
              if (typeof options == "string") {
                  templateName = value;
                  options = {};
              } else {
                  templateName = options['name'];
  
                  // Support "if"/"ifnot" conditions
                  if ('if' in options)
                      shouldDisplay = ko.utils.unwrapObservable(options['if']);
                  if (shouldDisplay && 'ifnot' in options)
                      shouldDisplay = !ko.utils.unwrapObservable(options['ifnot']);
              }
  
              if ('foreach' in options) {
                  // Render once for each data point (treating data set as empty if shouldDisplay==false)
                  var dataArray = (shouldDisplay && options['foreach']) || [];
                  templateComputed = ko.renderTemplateForEach(templateName || element, dataArray, options, element, bindingContext);
              } else if (!shouldDisplay) {
                  ko.virtualElements.emptyNode(element);
              } else {
                  // Render once for this single data point (or use the viewModel if no data was provided)
                  var innerBindingContext = ('data' in options) ?
                      bindingContext.createStaticChildContext(options['data'], options['as']) :  // Given an explitit 'data' value, we create a child binding context for it
                      bindingContext;                                                        // Given no explicit 'data' value, we retain the same binding context
                  templateComputed = ko.renderTemplate(templateName || element, innerBindingContext, options, element);
              }
  
              // It only makes sense to have a single template computed per element (otherwise which one should have its output displayed?)
              disposeOldComputedAndStoreNewOne(element, templateComputed);
          }
      };
  
      // Anonymous templates can't be rewritten. Give a nice error message if you try to do it.
      ko.expressionRewriting.bindingRewriteValidators['template'] = function(bindingValue) {
          var parsedBindingValue = ko.expressionRewriting.parseObjectLiteral(bindingValue);
  
          if ((parsedBindingValue.length == 1) && parsedBindingValue[0]['unknown'])
              return null; // It looks like a string literal, not an object literal, so treat it as a named template (which is allowed for rewriting)
  
          if (ko.expressionRewriting.keyValueArrayContainsKey(parsedBindingValue, "name"))
              return null; // Named templates can be rewritten, so return "no error"
          return "This template engine does not support anonymous templates nested within its templates";
      };
  
      ko.virtualElements.allowedBindings['template'] = true;
  })();
  
  ko.exportSymbol('setTemplateEngine', ko.setTemplateEngine);
  ko.exportSymbol('renderTemplate', ko.renderTemplate);
  // Go through the items that have been added and deleted and try to find matches between them.
  ko.utils.findMovesInArrayComparison = function (left, right, limitFailedCompares) {
      if (left.length && right.length) {
          var failedCompares, l, r, leftItem, rightItem;
          for (failedCompares = l = 0; (!limitFailedCompares || failedCompares < limitFailedCompares) && (leftItem = left[l]); ++l) {
              for (r = 0; rightItem = right[r]; ++r) {
                  if (leftItem['value'] === rightItem['value']) {
                      leftItem['moved'] = rightItem['index'];
                      rightItem['moved'] = leftItem['index'];
                      right.splice(r, 1);         // This item is marked as moved; so remove it from right list
                      failedCompares = r = 0;     // Reset failed compares count because we're checking for consecutive failures
                      break;
                  }
              }
              failedCompares += r;
          }
      }
  };
  
  ko.utils.compareArrays = (function () {
      var statusNotInOld = 'added', statusNotInNew = 'deleted';
  
      // Simple calculation based on Levenshtein distance.
      function compareArrays(oldArray, newArray, options) {
          // For backward compatibility, if the third arg is actually a bool, interpret
          // it as the old parameter 'dontLimitMoves'. Newer code should use { dontLimitMoves: true }.
          options = (typeof options === 'boolean') ? { 'dontLimitMoves': options } : (options || {});
          oldArray = oldArray || [];
          newArray = newArray || [];
  
          if (oldArray.length < newArray.length)
              return compareSmallArrayToBigArray(oldArray, newArray, statusNotInOld, statusNotInNew, options);
          else
              return compareSmallArrayToBigArray(newArray, oldArray, statusNotInNew, statusNotInOld, options);
      }
  
      function compareSmallArrayToBigArray(smlArray, bigArray, statusNotInSml, statusNotInBig, options) {
          var myMin = Math.min,
              myMax = Math.max,
              editDistanceMatrix = [],
              smlIndex, smlIndexMax = smlArray.length,
              bigIndex, bigIndexMax = bigArray.length,
              compareRange = (bigIndexMax - smlIndexMax) || 1,
              maxDistance = smlIndexMax + bigIndexMax + 1,
              thisRow, lastRow,
              bigIndexMaxForRow, bigIndexMinForRow;
  
          for (smlIndex = 0; smlIndex <= smlIndexMax; smlIndex++) {
              lastRow = thisRow;
              editDistanceMatrix.push(thisRow = []);
              bigIndexMaxForRow = myMin(bigIndexMax, smlIndex + compareRange);
              bigIndexMinForRow = myMax(0, smlIndex - 1);
              for (bigIndex = bigIndexMinForRow; bigIndex <= bigIndexMaxForRow; bigIndex++) {
                  if (!bigIndex)
                      thisRow[bigIndex] = smlIndex + 1;
                  else if (!smlIndex)  // Top row - transform empty array into new array via additions
                      thisRow[bigIndex] = bigIndex + 1;
                  else if (smlArray[smlIndex - 1] === bigArray[bigIndex - 1])
                      thisRow[bigIndex] = lastRow[bigIndex - 1];                  // copy value (no edit)
                  else {
                      var northDistance = lastRow[bigIndex] || maxDistance;       // not in big (deletion)
                      var westDistance = thisRow[bigIndex - 1] || maxDistance;    // not in small (addition)
                      thisRow[bigIndex] = myMin(northDistance, westDistance) + 1;
                  }
              }
          }
  
          var editScript = [], meMinusOne, notInSml = [], notInBig = [];
          for (smlIndex = smlIndexMax, bigIndex = bigIndexMax; smlIndex || bigIndex;) {
              meMinusOne = editDistanceMatrix[smlIndex][bigIndex] - 1;
              if (bigIndex && meMinusOne === editDistanceMatrix[smlIndex][bigIndex-1]) {
                  notInSml.push(editScript[editScript.length] = {     // added
                      'status': statusNotInSml,
                      'value': bigArray[--bigIndex],
                      'index': bigIndex });
              } else if (smlIndex && meMinusOne === editDistanceMatrix[smlIndex - 1][bigIndex]) {
                  notInBig.push(editScript[editScript.length] = {     // deleted
                      'status': statusNotInBig,
                      'value': smlArray[--smlIndex],
                      'index': smlIndex });
              } else {
                  --bigIndex;
                  --smlIndex;
                  if (!options['sparse']) {
                      editScript.push({
                          'status': "retained",
                          'value': bigArray[bigIndex] });
                  }
              }
          }
  
          // Set a limit on the number of consecutive non-matching comparisons; having it a multiple of
          // smlIndexMax keeps the time complexity of this algorithm linear.
          ko.utils.findMovesInArrayComparison(notInBig, notInSml, !options['dontLimitMoves'] && smlIndexMax * 10);
  
          return editScript.reverse();
      }
  
      return compareArrays;
  })();
  
  ko.exportSymbol('utils.compareArrays', ko.utils.compareArrays);
  (function () {
      // Objective:
      // * Given an input array, a container DOM node, and a function from array elements to arrays of DOM nodes,
      //   map the array elements to arrays of DOM nodes, concatenate together all these arrays, and use them to populate the container DOM node
      // * Next time we're given the same combination of things (with the array possibly having mutated), update the container DOM node
      //   so that its children is again the concatenation of the mappings of the array elements, but don't re-map any array elements that we
      //   previously mapped - retain those nodes, and just insert/delete other ones
  
      // "callbackAfterAddingNodes" will be invoked after any "mapping"-generated nodes are inserted into the container node
      // You can use this, for example, to activate bindings on those nodes.
  
      function mapNodeAndRefreshWhenChanged(containerNode, mapping, valueToMap, callbackAfterAddingNodes, index) {
          // Map this array value inside a dependentObservable so we re-map when any dependency changes
          var mappedNodes = [];
          var dependentObservable = ko.dependentObservable(function() {
              var newMappedNodes = mapping(valueToMap, index, ko.utils.fixUpContinuousNodeArray(mappedNodes, containerNode)) || [];
  
              // On subsequent evaluations, just replace the previously-inserted DOM nodes
              if (mappedNodes.length > 0) {
                  ko.utils.replaceDomNodes(mappedNodes, newMappedNodes);
                  if (callbackAfterAddingNodes)
                      ko.dependencyDetection.ignore(callbackAfterAddingNodes, null, [valueToMap, newMappedNodes, index]);
              }
  
              // Replace the contents of the mappedNodes array, thereby updating the record
              // of which nodes would be deleted if valueToMap was itself later removed
              mappedNodes.length = 0;
              ko.utils.arrayPushAll(mappedNodes, newMappedNodes);
          }, null, { disposeWhenNodeIsRemoved: containerNode, disposeWhen: function() { return !ko.utils.anyDomNodeIsAttachedToDocument(mappedNodes); } });
          return { mappedNodes : mappedNodes, dependentObservable : (dependentObservable.isActive() ? dependentObservable : undefined) };
      }
  
      var lastMappingResultDomDataKey = ko.utils.domData.nextKey(),
          deletedItemDummyValue = ko.utils.domData.nextKey();
  
      ko.utils.setDomNodeChildrenFromArrayMapping = function (domNode, array, mapping, options, callbackAfterAddingNodes) {
          // Compare the provided array against the previous one
          array = array || [];
          options = options || {};
          var isFirstExecution = ko.utils.domData.get(domNode, lastMappingResultDomDataKey) === undefined;
          var lastMappingResult = ko.utils.domData.get(domNode, lastMappingResultDomDataKey) || [];
          var lastArray = ko.utils.arrayMap(lastMappingResult, function (x) { return x.arrayEntry; });
          var editScript = ko.utils.compareArrays(lastArray, array, options['dontLimitMoves']);
  
          // Build the new mapping result
          var newMappingResult = [];
          var lastMappingResultIndex = 0;
          var newMappingResultIndex = 0;
  
          var nodesToDelete = [];
          var itemsToProcess = [];
          var itemsForBeforeRemoveCallbacks = [];
          var itemsForMoveCallbacks = [];
          var itemsForAfterAddCallbacks = [];
          var mapData;
  
          function itemMovedOrRetained(editScriptIndex, oldPosition) {
              mapData = lastMappingResult[oldPosition];
              if (newMappingResultIndex !== oldPosition)
                  itemsForMoveCallbacks[editScriptIndex] = mapData;
              // Since updating the index might change the nodes, do so before calling fixUpContinuousNodeArray
              mapData.indexObservable(newMappingResultIndex++);
              ko.utils.fixUpContinuousNodeArray(mapData.mappedNodes, domNode);
              newMappingResult.push(mapData);
              itemsToProcess.push(mapData);
          }
  
          function callCallback(callback, items) {
              if (callback) {
                  for (var i = 0, n = items.length; i < n; i++) {
                      if (items[i]) {
                          ko.utils.arrayForEach(items[i].mappedNodes, function(node) {
                              callback(node, i, items[i].arrayEntry);
                          });
                      }
                  }
              }
          }
  
          for (var i = 0, editScriptItem, movedIndex; editScriptItem = editScript[i]; i++) {
              movedIndex = editScriptItem['moved'];
              switch (editScriptItem['status']) {
                  case "deleted":
                      if (movedIndex === undefined) {
                          mapData = lastMappingResult[lastMappingResultIndex];
  
                          // Stop tracking changes to the mapping for these nodes
                          if (mapData.dependentObservable) {
                              mapData.dependentObservable.dispose();
                              mapData.dependentObservable = undefined;
                          }
  
                          // Queue these nodes for later removal
                          if (ko.utils.fixUpContinuousNodeArray(mapData.mappedNodes, domNode).length) {
                              if (options['beforeRemove']) {
                                  newMappingResult.push(mapData);
                                  itemsToProcess.push(mapData);
                                  if (mapData.arrayEntry === deletedItemDummyValue) {
                                      mapData = null;
                                  } else {
                                      itemsForBeforeRemoveCallbacks[i] = mapData;
                                  }
                              }
                              if (mapData) {
                                  nodesToDelete.push.apply(nodesToDelete, mapData.mappedNodes);
                              }
                          }
                      }
                      lastMappingResultIndex++;
                      break;
  
                  case "retained":
                      itemMovedOrRetained(i, lastMappingResultIndex++);
                      break;
  
                  case "added":
                      if (movedIndex !== undefined) {
                          itemMovedOrRetained(i, movedIndex);
                      } else {
                          mapData = { arrayEntry: editScriptItem['value'], indexObservable: ko.observable(newMappingResultIndex++) };
                          newMappingResult.push(mapData);
                          itemsToProcess.push(mapData);
                          if (!isFirstExecution)
                              itemsForAfterAddCallbacks[i] = mapData;
                      }
                      break;
              }
          }
  
          // Store a copy of the array items we just considered so we can difference it next time
          ko.utils.domData.set(domNode, lastMappingResultDomDataKey, newMappingResult);
  
          // Call beforeMove first before any changes have been made to the DOM
          callCallback(options['beforeMove'], itemsForMoveCallbacks);
  
          // Next remove nodes for deleted items (or just clean if there's a beforeRemove callback)
          ko.utils.arrayForEach(nodesToDelete, options['beforeRemove'] ? ko.cleanNode : ko.removeNode);
  
          // Next add/reorder the remaining items (will include deleted items if there's a beforeRemove callback)
          for (var i = 0, nextNode = ko.virtualElements.firstChild(domNode), lastNode, node; mapData = itemsToProcess[i]; i++) {
              // Get nodes for newly added items
              if (!mapData.mappedNodes)
                  ko.utils.extend(mapData, mapNodeAndRefreshWhenChanged(domNode, mapping, mapData.arrayEntry, callbackAfterAddingNodes, mapData.indexObservable));
  
              // Put nodes in the right place if they aren't there already
              for (var j = 0; node = mapData.mappedNodes[j]; nextNode = node.nextSibling, lastNode = node, j++) {
                  if (node !== nextNode)
                      ko.virtualElements.insertAfter(domNode, node, lastNode);
              }
  
              // Run the callbacks for newly added nodes (for example, to apply bindings, etc.)
              if (!mapData.initialized && callbackAfterAddingNodes) {
                  callbackAfterAddingNodes(mapData.arrayEntry, mapData.mappedNodes, mapData.indexObservable);
                  mapData.initialized = true;
              }
          }
  
          // If there's a beforeRemove callback, call it after reordering.
          // Note that we assume that the beforeRemove callback will usually be used to remove the nodes using
          // some sort of animation, which is why we first reorder the nodes that will be removed. If the
          // callback instead removes the nodes right away, it would be more efficient to skip reordering them.
          // Perhaps we'll make that change in the future if this scenario becomes more common.
          callCallback(options['beforeRemove'], itemsForBeforeRemoveCallbacks);
  
          // Replace the stored values of deleted items with a dummy value. This provides two benefits: it marks this item
          // as already "removed" so we won't call beforeRemove for it again, and it ensures that the item won't match up
          // with an actual item in the array and appear as "retained" or "moved".
          for (i = 0; i < itemsForBeforeRemoveCallbacks.length; ++i) {
              if (itemsForBeforeRemoveCallbacks[i]) {
                  itemsForBeforeRemoveCallbacks[i].arrayEntry = deletedItemDummyValue;
              }
          }
  
          // Finally call afterMove and afterAdd callbacks
          callCallback(options['afterMove'], itemsForMoveCallbacks);
          callCallback(options['afterAdd'], itemsForAfterAddCallbacks);
      }
  })();
  
  ko.exportSymbol('utils.setDomNodeChildrenFromArrayMapping', ko.utils.setDomNodeChildrenFromArrayMapping);
  ko.nativeTemplateEngine = function () {
      this['allowTemplateRewriting'] = false;
  }
  
  ko.nativeTemplateEngine.prototype = new ko.templateEngine();
  ko.nativeTemplateEngine.prototype.constructor = ko.nativeTemplateEngine;
  ko.nativeTemplateEngine.prototype['renderTemplateSource'] = function (templateSource, bindingContext, options, templateDocument) {
      var useNodesIfAvailable = !(ko.utils.ieVersion < 9), // IE<9 cloneNode doesn't work properly
          templateNodesFunc = useNodesIfAvailable ? templateSource['nodes'] : null,
          templateNodes = templateNodesFunc ? templateSource['nodes']() : null;
  
      if (templateNodes) {
          return ko.utils.makeArray(templateNodes.cloneNode(true).childNodes);
      } else {
          var templateText = templateSource['text']();
          return ko.utils.parseHtmlFragment(templateText, templateDocument);
      }
  };
  
  ko.nativeTemplateEngine.instance = new ko.nativeTemplateEngine();
  ko.setTemplateEngine(ko.nativeTemplateEngine.instance);
  
  ko.exportSymbol('nativeTemplateEngine', ko.nativeTemplateEngine);
  (function() {
      ko.jqueryTmplTemplateEngine = function () {
          // Detect which version of jquery-tmpl you're using. Unfortunately jquery-tmpl
          // doesn't expose a version number, so we have to infer it.
          // Note that as of Knockout 1.3, we only support jQuery.tmpl 1.0.0pre and later,
          // which KO internally refers to as version "2", so older versions are no longer detected.
          var jQueryTmplVersion = this.jQueryTmplVersion = (function() {
              if (!jQueryInstance || !(jQueryInstance['tmpl']))
                  return 0;
              // Since it exposes no official version number, we use our own numbering system. To be updated as jquery-tmpl evolves.
              try {
                  if (jQueryInstance['tmpl']['tag']['tmpl']['open'].toString().indexOf('__') >= 0) {
                      // Since 1.0.0pre, custom tags should append markup to an array called "__"
                      return 2; // Final version of jquery.tmpl
                  }
              } catch(ex) { /* Apparently not the version we were looking for */ }
  
              return 1; // Any older version that we don't support
          })();
  
          function ensureHasReferencedJQueryTemplates() {
              if (jQueryTmplVersion < 2)
                  throw new Error("Your version of jQuery.tmpl is too old. Please upgrade to jQuery.tmpl 1.0.0pre or later.");
          }
  
          function executeTemplate(compiledTemplate, data, jQueryTemplateOptions) {
              return jQueryInstance['tmpl'](compiledTemplate, data, jQueryTemplateOptions);
          }
  
          this['renderTemplateSource'] = function(templateSource, bindingContext, options, templateDocument) {
              templateDocument = templateDocument || document;
              options = options || {};
              ensureHasReferencedJQueryTemplates();
  
              // Ensure we have stored a precompiled version of this template (don't want to reparse on every render)
              var precompiled = templateSource['data']('precompiled');
              if (!precompiled) {
                  var templateText = templateSource['text']() || "";
                  // Wrap in "with($whatever.koBindingContext) { ... }"
                  templateText = "{{ko_with $item.koBindingContext}}" + templateText + "{{/ko_with}}";
  
                  precompiled = jQueryInstance['template'](null, templateText);
                  templateSource['data']('precompiled', precompiled);
              }
  
              var data = [bindingContext['$data']]; // Prewrap the data in an array to stop jquery.tmpl from trying to unwrap any arrays
              var jQueryTemplateOptions = jQueryInstance['extend']({ 'koBindingContext': bindingContext }, options['templateOptions']);
  
              var resultNodes = executeTemplate(precompiled, data, jQueryTemplateOptions);
              resultNodes['appendTo'](templateDocument.createElement("div")); // Using "appendTo" forces jQuery/jQuery.tmpl to perform necessary cleanup work
  
              jQueryInstance['fragments'] = {}; // Clear jQuery's fragment cache to avoid a memory leak after a large number of template renders
              return resultNodes;
          };
  
          this['createJavaScriptEvaluatorBlock'] = function(script) {
              return "{{ko_code ((function() { return " + script + " })()) }}";
          };
  
          this['addTemplate'] = function(templateName, templateMarkup) {
              document.write("<script type='text/html' id='" + templateName + "'>" + templateMarkup + "<" + "/script>");
          };
  
          if (jQueryTmplVersion > 0) {
              jQueryInstance['tmpl']['tag']['ko_code'] = {
                  open: "__.push($1 || '');"
              };
              jQueryInstance['tmpl']['tag']['ko_with'] = {
                  open: "with($1) {",
                  close: "} "
              };
          }
      };
  
      ko.jqueryTmplTemplateEngine.prototype = new ko.templateEngine();
      ko.jqueryTmplTemplateEngine.prototype.constructor = ko.jqueryTmplTemplateEngine;
  
      // Use this one by default *only if jquery.tmpl is referenced*
      var jqueryTmplTemplateEngineInstance = new ko.jqueryTmplTemplateEngine();
      if (jqueryTmplTemplateEngineInstance.jQueryTmplVersion > 0)
          ko.setTemplateEngine(jqueryTmplTemplateEngineInstance);
  
      ko.exportSymbol('jqueryTmplTemplateEngine', ko.jqueryTmplTemplateEngine);
  })();
  }));
  }());
  })();
  