text: // Knockout JavaScript library v2.3.0
  // (c) Steven Sanderson - 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'],
              jQuery = window["jQuery"],
              JSON = window["JSON"];
          (function (factory) {
              // Support three module loading scenarios
              if (typeof require === 'function' && typeof exports === 'object' && typeof module === 'object') {
                  // [1] CommonJS/Node.js
                  var target = module['exports'] || exports; // module.exports is for Node.js
                  factory(target);
              } else if (typeof define === 'function' && define['amd']) {
                  // [2] AMD anonymous module
                  define(['exports'], factory);
              } else {
                  // [3] No module loader (plain <script> tag) - put directly in global namespace
                  factory(window['ko'] = {});
              }
          }(function (koExports) {
              // 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 = "2.3.0";
  
              ko.exportSymbol('version', ko.version);
              ko.utils = (function () {
                  var objectForEach = function (obj, action) {
                      for (var prop in obj) {
                          if (obj.hasOwnProperty(prop)) {
                              action(prop, obj[prop]);
                          }
                      }
                  };
  
                  // 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");
                  }
  
                  return {
                      fieldsIncludedWithJsonPost: ['authenticity_token', /^__RequestVerificationToken(_.*)?$/],
  
                      arrayForEach: function (array, action) {
                          for (var i = 0, j = array.length; i < j; i++)
                              action(array[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]))
                                  return array[i];
                          return null;
                      },
  
                      arrayRemoveItem: function (array, itemToRemove) {
                          var index = ko.utils.arrayIndexOf(array, itemToRemove);
                          if (index >= 0)
                              array.splice(index, 1);
                      },
  
                      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]));
                          return result;
                      },
  
                      arrayFilter: function (array, predicate) {
                          array = array || [];
                          var result = [];
                          for (var i = 0, j = array.length; i < j; i++)
                              if (predicate(array[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 = array.indexOf ? array.indexOf(value) : ko.utils.arrayIndexOf(array, value);
                          if (existingEntryIndex < 0) {
                              if (included)
                                  array.push(value);
                          } else {
                              if (!included)
                                  array.splice(existingEntryIndex, 1);
                          }
                      },
  
                      extend: function (target, source) {
                          if (source) {
                              for (var prop in source) {
                                  if (source.hasOwnProperty(prop)) {
                                      target[prop] = source[prop];
                                  }
                              }
                          }
                          return target;
                      },
  
                      objectForEach: objectForEach,
  
                      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 container = document.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]);
                              }
                          }
                      },
  
                      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, '');
                      },
  
                      stringTokenize: function (string, delimiter) {
                          var result = [];
                          var tokens = (string || "").split(delimiter);
                          for (var i = 0, j = tokens.length; i < j; i++) {
                              var trimmed = ko.utils.stringTrim(tokens[i]);
                              if (trimmed !== "")
                                  result.push(trimmed);
                          }
                          return result;
                      },
  
                      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 (containedByNode.compareDocumentPosition)
                              return (containedByNode.compareDocumentPosition(node) & 16) == 16;
                          while (node != null) {
                              if (node == containedByNode)
                                  return true;
                              node = node.parentNode;
                          }
                          return false;
                      },
  
                      domNodeIsAttachedToDocument: function (node) {
                          return ko.utils.domNodeIsContainedBy(node, node.ownerDocument);
                      },
  
                      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();
                      },
  
                      registerEventHandler: function (element, eventType, handler) {
                          var mustUseAttachEvent = ieVersion && eventsThatMustBeRegisteredUsingAttachEvent[eventType];
                          if (!mustUseAttachEvent && typeof jQuery != "undefined") {
                              if (isClickOnCheckableElement(element, eventType)) {
                                  // For click events on checkboxes, jQuery interferes with the event handling in an awkward way:
                                  // it toggles the element checked state *after* the click event handlers run, whereas native
                                  // click events toggle the checked state *before* the event handler.
                                  // Fix this by intecepting the handler and applying the correct checkedness before it runs.
                                  var originalHandler = handler;
                                  handler = function (event, eventData) {
                                      var jQuerySuppliedCheckedState = this.checked;
                                      if (eventData)
                                          this.checked = eventData.checkedStateBeforeEvent !== true;
                                      originalHandler.call(this, event);
                                      this.checked = jQuerySuppliedCheckedState; // Restore the state jQuery applied
                                  };
                              }
                              jQuery(element)['bind'](eventType, handler);
                          } else if (!mustUseAttachEvent && typeof element.addEventListener == "function")
                              element.addEventListener(eventType, handler, false);
                          else if (typeof element.attachEvent != "undefined") {
                              var attachEventHandler = function (event) { handler.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");
  
                          if (typeof jQuery != "undefined") {
                              var eventData = [];
                              if (isClickOnCheckableElement(element, eventType)) {
                                  // Work around the jQuery "click events on checkboxes" issue described above by storing the original checked state before triggering the handler
                                  eventData.push({ checkedStateBeforeEvent: element.checked });
                              }
                              jQuery(element)['trigger'](eventType, eventData);
                          } 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 (typeof element.fireEvent != "undefined") {
                              // Unlike other browsers, IE doesn't change the checked state of checkboxes/radiobuttons when you trigger their "click" event
                              // so to make it consistent, we'll do it manually here
                              if (isClickOnCheckableElement(element, eventType))
                                  element.checked = element.checked !== true;
                              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: function (node, classNames, shouldHaveClass) {
                          if (classNames) {
                              var cssClassNameRegex = /\S+/g,
                                  currentClassNames = node.className.match(cssClassNameRegex) || [];
                              ko.utils.arrayForEach(classNames.match(cssClassNameRegex), function (className) {
                                  ko.utils.addOrRemoveItem(currentClassNames, className, shouldHaveClass);
                              });
                              node.className = currentClassNames.join(" ");
                          }
                      },
  
                      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, [document.createTextNode(value)]);
                          } else {
                              innerTextNode.data = value;
                          }
  
                          ko.utils.forceRefresh(element);
                      },
  
                      setElementName: function (element, name) {
                          element.name = name;
  
                          // Workaround IE 6/7 issue
                          // - https://github.com/SteveSanderson/knockout/issues/197
                          // - http://www.matts411.com/post/setting_the_name_attribute_in_ie_dom/
                          if (ieVersion <= 7) {
                              try {
                                  element.mergeAttributes(document.createElement("<input name='" + element.name + "'/>"), false);
                              }
                              catch (e) { } // For IE9 with doc mode "IE9 Standards" and browser mode "IE9 Compatibility View"
                          }
                      },
  
                      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;
                      },
  
                      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.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.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('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, args = Array.prototype.slice.call(arguments), object = args.shift();
                      return function () {
                          return originalFunction.apply(object, args.concat(Array.prototype.slice.call(arguments)));
                      };
                  };
              }
  
              ko.utils.domData = new (function () {
                  var uniqueId = 0;
                  var dataStoreKeyExpandoPropertyName = "__ko__" + (new Date).getTime();
                  var dataStore = {};
                  return {
                      get: function (node, key) {
                          var allDataForNode = ko.utils.domData.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 (ko.utils.domData.getAll(node, false) === undefined)
                                  return;
                          }
                          var allDataForNode = ko.utils.domData.getAll(node, true);
                          allDataForNode[key] = value;
                      },
                      getAll: function (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];
                      },
                      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;
                      }
                  }
              })();
  
              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_domNodeDisposal__" + (new Date).getTime();
                  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);
                      }
  
                      // Also erase the DOM data
                      ko.utils.domData.clear(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 ((typeof jQuery == "function") && (typeof jQuery['cleanData'] == "function"))
                          jQuery['cleanData']([node]);
  
                      // Also 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);
                      }
                  }
              })();
              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 leadingCommentRegex = /^(\s*)<!--(.*?)-->/;
  
                  function simpleHtmlParse(html) {
                      // 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 = document.createElement("div");
  
                      // Finds the first match from the left column, and returns the corresponding "wrap" data from the right column
                      var wrap = tags.match(/^<(thead|tbody|tfoot)/) && [1, "<table>", "</table>"] ||
                          !tags.indexOf("<tr") && [2, "<table><tbody>", "</tbody></table>"] ||
                          (!tags.indexOf("<td") || !tags.indexOf("<th")) && [3, "<table><tbody><tr>", "</tr></tbody></table>"] ||
                     /* anything else */[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 window['innerShiv'] == "function") {
                          div.appendChild(window['innerShiv'](markup));
                      } else {
                          div.innerHTML = markup;
                      }
  
                      // Move to the right depth
                      while (wrap[0]--)
                          div = div.lastChild;
  
                      return ko.utils.makeArray(div.lastChild.childNodes);
                  }
  
                  function jQueryHtmlParse(html) {
                      // jQuery's "parseHTML" function was introduced in jQuery 1.8.0 and is a documented public API.
                      if (jQuery['parseHTML']) {
                          return jQuery['parseHTML'](html) || []; // 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 = jQuery['clean']([html]);
  
                          // 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) {
                      return typeof jQuery != 'undefined' ? jQueryHtmlParse(html)   // As below, benefit from jQuery's optimisations where possible
                          : simpleHtmlParse(html);  // ... 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 (typeof jQuery != 'undefined') {
                              jQuery(node)['html'](html);
                          } else {
                              // ... otherwise, use KO's own parsing logic.
                              var parsedNodes = ko.utils.parseHtmlFragment(html);
                              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.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 = setTimeout(function () {
                                  target(value);
                              }, timeout);
                          }
                      });
                  },
  
                  'notify': function (target, notifyWhen) {
                      target["equalityComparer"] = notifyWhen == "always"
                          ? function () { return false } // Treat all values as not equal
                          : ko.observable["fn"]["equalityComparer"];
                      return target;
                  }
              };
  
              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);
                          }
                      });
                  }
                  return target;
              }
  
              ko.exportSymbol('extenders', ko.extenders);
  
              ko.subscription = function (target, callback, disposeCallback) {
                  this.target = target;
                  this.callback = callback;
                  this.disposeCallback = disposeCallback;
                  ko.exportProperty(this, 'dispose', this.dispose);
              };
              ko.subscription.prototype.dispose = function () {
                  this.isDisposed = true;
                  this.disposeCallback();
              };
  
              ko.subscribable = function () {
                  this._subscriptions = {};
  
                  ko.utils.extend(this, ko.subscribable['fn']);
                  ko.exportProperty(this, 'subscribe', this.subscribe);
                  ko.exportProperty(this, 'extend', this.extend);
                  ko.exportProperty(this, 'getSubscriptionsCount', this.getSubscriptionsCount);
              }
  
              var defaultEvent = "change";
  
              ko.subscribable['fn'] = {
                  subscribe: function (callback, callbackTarget, event) {
                      event = event || defaultEvent;
                      var boundCallback = callbackTarget ? callback.bind(callbackTarget) : callback;
  
                      var subscription = new ko.subscription(this, boundCallback, function () {
                          ko.utils.arrayRemoveItem(this._subscriptions[event], subscription);
                      }.bind(this));
  
                      if (!this._subscriptions[event])
                          this._subscriptions[event] = [];
                      this._subscriptions[event].push(subscription);
                      return subscription;
                  },
  
                  "notifySubscribers": function (valueToNotify, event) {
                      event = event || defaultEvent;
                      if (this._subscriptions[event]) {
                          ko.dependencyDetection.ignore(function () {
                              ko.utils.arrayForEach(this._subscriptions[event].slice(0), function (subscription) {
                                  // In case a subscription was disposed during the arrayForEach cycle, check
                                  // for isDisposed on each subscription before invoking its callback
                                  if (subscription && (subscription.isDisposed !== true))
                                      subscription.callback(valueToNotify);
                              });
                          }, this);
                      }
                  },
  
                  getSubscriptionsCount: function () {
                      var total = 0;
                      ko.utils.objectForEach(this._subscriptions, function (eventName, subscriptions) {
                          total += subscriptions.length;
                      });
                      return total;
                  },
  
                  extend: applyExtenders
              };
  
              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.dependencyDetection = (function () {
                  var _frames = [];
  
                  return {
                      begin: function (callback) {
                          _frames.push({ callback: callback, distinctDependencies: [] });
                      },
  
                      end: function () {
                          _frames.pop();
                      },
  
                      registerDependency: function (subscribable) {
                          if (!ko.isSubscribable(subscribable))
                              throw new Error("Only subscribable things can act as dependencies");
                          if (_frames.length > 0) {
                              var topFrame = _frames[_frames.length - 1];
                              if (!topFrame || ko.utils.arrayIndexOf(topFrame.distinctDependencies, subscribable) >= 0)
                                  return;
                              topFrame.distinctDependencies.push(subscribable);
                              topFrame.callback(subscribable);
                          }
                      },
  
                      ignore: function (callback, callbackTarget, callbackArgs) {
                          try {
                              _frames.push(null);
                              return callback.apply(callbackTarget, callbackArgs || []);
                          } finally {
                              _frames.pop();
                          }
                      }
                  };
              })();
              var primitiveTypes = { 'undefined': true, 'boolean': true, 'number': true, 'string': true };
  
              ko.observable = function (initialValue) {
                  var _latestValue = initialValue;
  
                  function observable() {
                      if (arguments.length > 0) {
                          // Write
  
                          // Ignore writes if the value hasn't changed
                          if ((!observable['equalityComparer']) || !observable['equalityComparer'](_latestValue, arguments[0])) {
                              observable.valueWillMutate();
                              _latestValue = arguments[0];
                              if (DEBUG) observable._latestValue = _latestValue;
                              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 _latestValue;
                      }
                  }
                  if (DEBUG) observable._latestValue = _latestValue;
                  ko.subscribable.call(observable);
                  observable.peek = function () { return _latestValue };
                  observable.valueHasMutated = function () { observable["notifySubscribers"](_latestValue); }
                  observable.valueWillMutate = function () { observable["notifySubscribers"](_latestValue, "beforeChange"); }
                  ko.utils.extend(observable, ko.observable['fn']);
  
                  ko.exportProperty(observable, 'peek', observable.peek);
                  ko.exportProperty(observable, "valueHasMutated", observable.valueHasMutated);
                  ko.exportProperty(observable, "valueWillMutate", observable.valueWillMutate);
  
                  return observable;
              }
  
              ko.observable['fn'] = {
                  "equalityComparer": function valuesArePrimitiveAndEqual(a, b) {
                      var oldValueIsPrimitive = (a === null) || (typeof (a) in primitiveTypes);
                      return oldValueIsPrimitive ? (a === b) : false;
                  }
              };
  
              var protoProperty = ko.observable.protoProperty = "__ko_proto__";
              ko.observable['fn'][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.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.extend(result, ko.observableArray['fn']);
                  return result;
              };
  
              ko.observableArray['fn'] = {
                  'remove': function (valueOrPredicate) {
                      var underlyingArray = this.peek();
                      var removedValues = [];
                      var predicate = typeof valueOrPredicate == "function" ? 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" ? 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();
                      }
                  }
              };
  
              // 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();
                      var methodCallResult = underlyingArray[methodName].apply(underlyingArray, arguments);
                      this.valueHasMutated();
                      return 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);
              ko.dependentObservable = function (evaluatorFunctionOrOptions, evaluatorFunctionTarget, options) {
                  var _latestValue,
                      _hasBeenEvaluated = false,
                      _isBeingEvaluated = false,
                      readFunction = evaluatorFunctionOrOptions;
  
                  if (readFunction && typeof readFunction == "object") {
                      // Single-parameter syntax - everything is on this "options" param
                      options = readFunction;
                      readFunction = options["read"];
                  } else {
                      // Multi-parameter syntax - construct the options according to the params passed
                      options = options || {};
                      if (!readFunction)
                          readFunction = options["read"];
                  }
                  if (typeof readFunction != "function")
                      throw new Error("Pass a function that returns the value of the ko.computed");
  
                  function addSubscriptionToDependency(subscribable) {
                      _subscriptionsToDependencies.push(subscribable.subscribe(evaluatePossiblyAsync));
                  }
  
                  function disposeAllSubscriptionsToDependencies() {
                      ko.utils.arrayForEach(_subscriptionsToDependencies, function (subscription) {
                          subscription.dispose();
                      });
                      _subscriptionsToDependencies = [];
                  }
  
                  function evaluatePossiblyAsync() {
                      var throttleEvaluationTimeout = dependentObservable['throttleEvaluation'];
                      if (throttleEvaluationTimeout && throttleEvaluationTimeout >= 0) {
                          clearTimeout(evaluationTimeoutInstance);
                          evaluationTimeoutInstance = setTimeout(evaluateImmediate, throttleEvaluationTimeout);
                      } else
                          evaluateImmediate();
                  }
  
                  function evaluateImmediate() {
                      if (_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;
                      }
  
                      // Don't dispose on first evaluation, because the "disposeWhen" callback might
                      // e.g., dispose when the associated DOM element isn't in the doc, and it's not
                      // going to be in the doc until *after* the first evaluation
                      if (_hasBeenEvaluated && disposeWhen()) {
                          dispose();
                          return;
                      }
  
                      _isBeingEvaluated = true;
                      try {
                          // 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 disposalCandidates = ko.utils.arrayMap(_subscriptionsToDependencies, function (item) { return item.target; });
  
                          ko.dependencyDetection.begin(function (subscribable) {
                              var inOld;
                              if ((inOld = ko.utils.arrayIndexOf(disposalCandidates, subscribable)) >= 0)
                                  disposalCandidates[inOld] = undefined; // Don't want to dispose this subscription, as it's still being used
                              else
                                  addSubscriptionToDependency(subscribable); // Brand new subscription - add it
                          });
  
                          var newValue = readFunction.call(evaluatorFunctionTarget);
  
                          // For each subscription no longer being used, remove it from the active subscriptions list and dispose it
                          for (var i = disposalCandidates.length - 1; i >= 0; i--) {
                              if (disposalCandidates[i])
                                  _subscriptionsToDependencies.splice(i, 1)[0].dispose();
                          }
                          _hasBeenEvaluated = true;
  
                          dependentObservable["notifySubscribers"](_latestValue, "beforeChange");
  
                          _latestValue = newValue;
                          if (DEBUG) dependentObservable._latestValue = _latestValue;
                          dependentObservable["notifySubscribers"](_latestValue);
                      } finally {
                          ko.dependencyDetection.end();
                          _isBeingEvaluated = false;
                      }
  
                      if (!_subscriptionsToDependencies.length)
                          dispose();
                  }
  
                  function dependentObservable() {
                      if (arguments.length > 0) {
                          if (typeof writeFunction === "function") {
                              // Writing a value
                              writeFunction.apply(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
                          if (!_hasBeenEvaluated)
                              evaluateImmediate();
                          ko.dependencyDetection.registerDependency(dependentObservable);
                          return _latestValue;
                      }
                  }
  
                  function peek() {
                      if (!_hasBeenEvaluated)
                          evaluateImmediate();
                      return _latestValue;
                  }
  
                  function isActive() {
                      return !_hasBeenEvaluated || _subscriptionsToDependencies.length > 0;
                  }
  
                  // By here, "options" is always non-null
                  var writeFunction = options["write"],
                      disposeWhenNodeIsRemoved = options["disposeWhenNodeIsRemoved"] || options.disposeWhenNodeIsRemoved || null,
                      disposeWhen = options["disposeWhen"] || options.disposeWhen || function () { return false; },
                      dispose = disposeAllSubscriptionsToDependencies,
                      _subscriptionsToDependencies = [],
                      evaluationTimeoutInstance = null;
  
                  if (!evaluatorFunctionTarget)
                      evaluatorFunctionTarget = options["owner"];
  
                  dependentObservable.peek = peek;
                  dependentObservable.getDependenciesCount = function () { return _subscriptionsToDependencies.length; };
                  dependentObservable.hasWriteFunction = typeof options["write"] === "function";
                  dependentObservable.dispose = function () { dispose(); };
                  dependentObservable.isActive = isActive;
  
                  ko.subscribable.call(dependentObservable);
                  ko.utils.extend(dependentObservable, ko.dependentObservable['fn']);
  
                  ko.exportProperty(dependentObservable, 'peek', dependentObservable.peek);
                  ko.exportProperty(dependentObservable, 'dispose', dependentObservable.dispose);
                  ko.exportProperty(dependentObservable, 'isActive', dependentObservable.isActive);
                  ko.exportProperty(dependentObservable, 'getDependenciesCount', dependentObservable.getDependenciesCount);
  
                  // Evaluate, unless deferEvaluation is true
                  if (options['deferEvaluation'] !== true)
                      evaluateImmediate();
  
                  // Build "disposeWhenNodeIsRemoved" and "disposeWhenNodeIsRemovedCallback" option values.
                  // But skip if isActive is false (there will never be any dependencies to dispose).
                  // (Note: "disposeWhenNodeIsRemoved" option both proactively disposes as soon as the node is removed using ko.removeNode(),
                  // plus adds a "disposeWhen" callback that, on each evaluation, disposes if the node was removed by some other means.)
                  if (disposeWhenNodeIsRemoved && isActive()) {
                      dispose = function () {
                          ko.utils.domNodeDisposal.removeDisposeCallback(disposeWhenNodeIsRemoved, dispose);
                          disposeAllSubscriptionsToDependencies();
                      };
                      ko.utils.domNodeDisposal.addDisposeCallback(disposeWhenNodeIsRemoved, dispose);
                      var existingDisposeWhenFunction = disposeWhen;
                      disposeWhen = function () {
                          return !ko.utils.domNodeIsAttachedToDocument(disposeWhenNodeIsRemoved) || existingDisposeWhenFunction();
                      }
                  }
  
                  return dependentObservable;
              };
  
              ko.isComputed = function (instance) {
                  return ko.hasPrototype(instance, ko.dependentObservable);
              };
  
              var protoProp = ko.observable.protoProperty; // == "__ko_proto__"
              ko.dependentObservable[protoProp] = ko.observable;
  
              ko.dependentObservable['fn'] = {};
              ko.dependentObservable['fn'][protoProp] = ko.dependentObservable;
  
              ko.exportSymbol('dependentObservable', ko.dependentObservable);
              ko.exportSymbol('computed', ko.dependentObservable); // Make "ko.computed" an alias for "ko.dependentObservable"
              ko.exportSymbol('isComputed', ko.isComputed);
  
              (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 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) {
                          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 = undefined;
                                  if (value === null || value === undefined)
                                      element.selectedIndex = -1;
                                  for (var i = element.options.length - 1; i >= 0; i--) {
                                      if (ko.selectExtensions.readValue(element.options[i]) == value) {
                                          element.selectedIndex = i;
                                          break;
                                      }
                                  }
                                  // for drop-down select, ensure first is selected
                                  if (!(element.size > 1) && element.selectedIndex === -1) {
                                      element.selectedIndex = 0;
                                  }
                                  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 restoreCapturedTokensRegex = /\@ko_token_(\d+)\@/g;
                  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).
                  var javaScriptAssignmentTarget = /^(?:[$_a-z][$\w]*|(.+)(\.\s*[$_a-z][$\w]*|\[.+\]))$/i;
  
                  function restoreTokens(string, tokens) {
                      var prevValue = null;
                      while (string != prevValue) { // Keep restoring tokens until it no longer makes a difference (they may be nested)
                          prevValue = string;
                          string = string.replace(restoreCapturedTokensRegex, function (match, tokenIndex) {
                              return tokens[tokenIndex];
                          });
                      }
                      return string;
                  }
  
                  function getWriteableValue(expression) {
                      if (ko.utils.arrayIndexOf(javaScriptReservedWords, ko.utils.stringTrim(expression).toLowerCase()) >= 0)
                          return false;
                      var match = expression.match(javaScriptAssignmentTarget);
                      return match === null ? false : match[1] ? ('Object(' + match[1] + ')' + match[2]) : expression;
                  }
  
                  function ensureQuoted(key) {
                      var trimmedKey = ko.utils.stringTrim(key);
                      switch (trimmedKey.length && trimmedKey.charAt(0)) {
                          case "'":
                          case '"':
                              return key;
                          default:
                              return "'" + trimmedKey + "'";
                      }
                  }
  
                  return {
                      bindingRewriteValidators: [],
  
                      parseObjectLiteral: function (objectLiteralString) {
                          // A full tokeniser+lexer would add too much weight to this library, so here's a simple parser
                          // that is sufficient just to split an object literal string into a set of top-level key-value pairs
  
                          var str = ko.utils.stringTrim(objectLiteralString);
                          if (str.length < 3)
                              return [];
                          if (str.charAt(0) === "{")// Ignore any braces surrounding the whole object literal
                              str = str.substring(1, str.length - 1);
  
                          // Pull out any string literals and regex literals
                          var tokens = [];
                          var tokenStart = null, tokenEndChar;
                          for (var position = 0; position < str.length; position++) {
                              var c = str.charAt(position);
                              if (tokenStart === null) {
                                  switch (c) {
                                      case '"':
                                      case "'":
                                      case "/":
                                          tokenStart = position;
                                          tokenEndChar = c;
                                          break;
                                  }
                              } else if ((c == tokenEndChar) && (str.charAt(position - 1) !== "\\")) {
                                  var token = str.substring(tokenStart, position + 1);
                                  tokens.push(token);
                                  var replacement = "@ko_token_" + (tokens.length - 1) + "@";
                                  str = str.substring(0, tokenStart) + replacement + str.substring(position + 1);
                                  position -= (token.length - replacement.length);
                                  tokenStart = null;
                              }
                          }
  
                          // Next pull out balanced paren, brace, and bracket blocks
                          tokenStart = null;
                          tokenEndChar = null;
                          var tokenDepth = 0, tokenStartChar = null;
                          for (var position = 0; position < str.length; position++) {
                              var c = str.charAt(position);
                              if (tokenStart === null) {
                                  switch (c) {
                                      case "{": tokenStart = position; tokenStartChar = c;
                                          tokenEndChar = "}";
                                          break;
                                      case "(": tokenStart = position; tokenStartChar = c;
                                          tokenEndChar = ")";
                                          break;
                                      case "[": tokenStart = position; tokenStartChar = c;
                                          tokenEndChar = "]";
                                          break;
                                  }
                              }
  
                              if (c === tokenStartChar)
                                  tokenDepth++;
                              else if (c === tokenEndChar) {
                                  tokenDepth--;
                                  if (tokenDepth === 0) {
                                      var token = str.substring(tokenStart, position + 1);
                                      tokens.push(token);
                                      var replacement = "@ko_token_" + (tokens.length - 1) + "@";
                                      str = str.substring(0, tokenStart) + replacement + str.substring(position + 1);
                                      position -= (token.length - replacement.length);
                                      tokenStart = null;
                                  }
                              }
                          }
  
                          // Now we can safely split on commas to get the key/value pairs
                          var result = [];
                          var keyValuePairs = str.split(",");
                          for (var i = 0, j = keyValuePairs.length; i < j; i++) {
                              var pair = keyValuePairs[i];
                              var colonPos = pair.indexOf(":");
                              if ((colonPos > 0) && (colonPos < pair.length - 1)) {
                                  var key = pair.substring(0, colonPos);
                                  var value = pair.substring(colonPos + 1);
                                  result.push({ 'key': restoreTokens(key, tokens), 'value': restoreTokens(value, tokens) });
                              } else {
                                  result.push({ 'unknown': restoreTokens(pair, tokens) });
                              }
                          }
                          return result;
                      },
  
                      preProcessBindings: function (objectLiteralStringOrKeyValueArray) {
                          var keyValueArray = typeof objectLiteralStringOrKeyValueArray === "string"
                              ? ko.expressionRewriting.parseObjectLiteral(objectLiteralStringOrKeyValueArray)
                              : objectLiteralStringOrKeyValueArray;
                          var resultStrings = [], propertyAccessorResultStrings = [];
  
                          var keyValueEntry;
                          for (var i = 0; keyValueEntry = keyValueArray[i]; i++) {
                              if (resultStrings.length > 0)
                                  resultStrings.push(",");
  
                              if (keyValueEntry['key']) {
                                  var quotedKey = ensureQuoted(keyValueEntry['key']), val = keyValueEntry['value'];
                                  resultStrings.push(quotedKey);
                                  resultStrings.push(":");
                                  resultStrings.push(val);
  
                                  if (val = getWriteableValue(ko.utils.stringTrim(val))) {
                                      if (propertyAccessorResultStrings.length > 0)
                                          propertyAccessorResultStrings.push(", ");
                                      propertyAccessorResultStrings.push(quotedKey + " : function(__ko_value) { " + val + " = __ko_value; }");
                                  }
                              } else if (keyValueEntry['unknown']) {
                                  resultStrings.push(keyValueEntry['unknown']);
                              }
                          }
  
                          var combinedResult = resultStrings.join("");
                          if (propertyAccessorResultStrings.length > 0) {
                              var allPropertyAccessors = propertyAccessorResultStrings.join("");
                              combinedResult = combinedResult + ", '_ko_property_writers' : { " + allPropertyAccessors + " } ";
                          }
  
                          return combinedResult;
                      },
  
                      keyValueArrayContainsKey: function (keyValueArray, key) {
                          for (var i = 0; i < keyValueArray.length; i++)
                              if (ko.utils.stringTrim(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
                      // allBindingsAccessor: All 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, allBindingsAccessor, key, value, checkIfDifferent) {
                          if (!property || !ko.isObservable(property)) {
                              var propWriters = allBindingsAccessor()['_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);
  
              // 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*-->$/ : /^\s*ko(?:\s+(.+\s*\:[\s\S]*))?\s*$/;
                  var endCommentRegex = commentNodesHaveTextProperty ? /^<!--\s*\/ko\s*-->$/ : /^\s*\/ko\s*$/;
                  var htmlTagsWithOptionallyClosingChildren = { 'ul': true, 'ol': true };
  
                  function isStartComment(node) {
                      return (node.nodeType == 8) && (commentNodesHaveTextProperty ? node.text : node.nodeValue).match(startCommentRegex);
                  }
  
                  function isEndComment(node) {
                      return (node.nodeType == 8) && (commentNodesHaveTextProperty ? node.text : node.nodeValue).match(endCommentRegex);
                  }
  
                  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;
                      },
  
                      virtualNodeBindingValue: function (node) {
                          var regexMatch = isStartComment(node);
                          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: return node.getAttribute(defaultBindingAttributeName) != null;   // Element
                              case 8: return ko.virtualElements.virtualNodeBindingValue(node) != null; // Comment node
                              default: return false;
                          }
                      },
  
                      'getBindings': function (node, bindingContext) {
                          var bindingsString = this['getBindingsString'](node, bindingContext);
                          return bindingsString ? this['parseBindingsString'](bindingsString, bindingContext, node) : 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.
                      '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) {
                          try {
                              var bindingFunction = createBindingsStringEvaluatorViaCache(bindingsString, this.bindingCache);
                              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) {
                      var cacheKey = bindingsString;
                      return cache[cacheKey]
                          || (cache[cacheKey] = createBindingsStringEvaluator(bindingsString));
                  }
  
                  function createBindingsStringEvaluator(bindingsString) {
                      // 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),
                          functionBody = "with($context){with($data||{}){return{" + rewrittenBindings + "}}}";
                      return new Function("$context", "$element", functionBody);
                  }
              })();
  
              ko.exportSymbol('bindingProvider', ko.bindingProvider);
              (function () {
                  ko.bindingHandlers = {};
  
                  ko.bindingContext = function (dataItem, parentBindingContext, dataItemAlias) {
                      if (parentBindingContext) {
                          ko.utils.extend(this, parentBindingContext); // Inherit $root and any custom properties
                          this['$parentContext'] = parentBindingContext;
                          this['$parent'] = parentBindingContext['$data'];
                          this['$parents'] = (parentBindingContext['$parents'] || []).slice(0);
                          this['$parents'].unshift(this['$parent']);
                      } else {
                          this['$parents'] = [];
                          this['$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
                          this['ko'] = ko;
                      }
                      this['$data'] = dataItem;
                      if (dataItemAlias)
                          this[dataItemAlias] = dataItem;
                  }
                  ko.bindingContext.prototype['createChildContext'] = function (dataItem, dataItemAlias) {
                      return new ko.bindingContext(dataItem, this, dataItemAlias);
                  };
                  ko.bindingContext.prototype['extend'] = function (properties) {
                      var clone = ko.utils.extend(new ko.bindingContext(), this);
                      return ko.utils.extend(clone, properties);
                  };
  
                  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(viewModel, elementOrVirtualElement, bindingContextsMayDifferFromDomParentElement) {
                      var currentChild, 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(viewModel, currentChild, bindingContextsMayDifferFromDomParentElement);
                      }
                  }
  
                  function applyBindingsToNodeAndDescendantsInternal(viewModel, 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, viewModel, bindingContextMayDifferFromDomParentElement).shouldBindDescendants;
  
                      if (shouldBindDescendants) {
                          // 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(viewModel, nodeVerified, /* bindingContextsMayDifferFromDomParentElement: */ !isElement);
                      }
                  }
  
                  var boundElementDomDataKey = '__ko_boundElement';
                  function applyBindingsToNodeInternal(node, bindings, viewModelOrBindingContext, bindingContextMayDifferFromDomParentElement) {
                      // Need to be sure that inits are only run once, and updates never run until all the inits have been run
                      var initPhase = 0; // 0 = before all inits, 1 = during inits, 2 = after all inits
  
                      // Each time the dependentObservable is evaluated (after data changes),
                      // the binding attribute is reparsed so that it can pick out the correct
                      // model properties in the context of the changed data.
                      // DOM event callbacks need to be able to access this changed data,
                      // so we need a single parsedBindings variable (shared by all callbacks
                      // associated with this node's bindings) that all the closures can access.
                      var parsedBindings;
                      function makeValueAccessor(bindingKey) {
                          return function () { return parsedBindings[bindingKey] }
                      }
                      function parsedBindingsAccessor() {
                          return parsedBindings;
                      }
  
                      var bindingHandlerThatControlsDescendantBindings;
  
                      // Prevent multiple applyBindings calls for the same node, except when a binding value is specified
                      var alreadyBound = ko.utils.domData.get(node, boundElementDomDataKey);
                      if (!bindings) {
                          if (alreadyBound) {
                              throw Error("You cannot apply bindings multiple times to the same element.");
                          }
                          ko.utils.domData.set(node, boundElementDomDataKey, true);
                      }
  
                      ko.dependentObservable(
                          function () {
                              // Ensure we have a nonnull binding context to work with
                              var bindingContextInstance = viewModelOrBindingContext && (viewModelOrBindingContext instanceof ko.bindingContext)
                                  ? viewModelOrBindingContext
                                  : new ko.bindingContext(ko.utils.unwrapObservable(viewModelOrBindingContext));
                              var viewModel = bindingContextInstance['$data'];
  
                              // 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, bindingContextInstance);
  
                              // Use evaluatedBindings if given, otherwise fall back on asking the bindings provider to give us some bindings
                              var evaluatedBindings = (typeof bindings == "function") ? bindings(bindingContextInstance, node) : bindings;
                              parsedBindings = evaluatedBindings || ko.bindingProvider['instance']['getBindings'](node, bindingContextInstance);
  
                              if (parsedBindings) {
                                  // First run all the inits, so bindings can register for notification on changes
                                  if (initPhase === 0) {
                                      initPhase = 1;
                                      ko.utils.objectForEach(parsedBindings, function (bindingKey) {
                                          var binding = ko.bindingHandlers[bindingKey];
                                          if (binding && node.nodeType === 8)
                                              validateThatBindingIsAllowedForVirtualElements(bindingKey);
  
                                          if (binding && typeof binding["init"] == "function") {
                                              var handlerInitFn = binding["init"];
                                              var initResult = handlerInitFn(node, makeValueAccessor(bindingKey), parsedBindingsAccessor, viewModel, bindingContextInstance);
  
                                              // 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;
                                              }
                                          }
                                      });
                                      initPhase = 2;
                                  }
  
                                  // ... then run all the updates, which might trigger changes even on the first evaluation
                                  if (initPhase === 2) {
                                      ko.utils.objectForEach(parsedBindings, function (bindingKey) {
                                          var binding = ko.bindingHandlers[bindingKey];
                                          if (binding && typeof binding["update"] == "function") {
                                              var handlerUpdateFn = binding["update"];
                                              handlerUpdateFn(node, makeValueAccessor(bindingKey), parsedBindingsAccessor, viewModel, bindingContextInstance);
                                          }
                                      });
                                  }
                              }
                          },
                          null,
                          { disposeWhenNodeIsRemoved: node }
                      );
  
                      return {
                          shouldBindDescendants: bindingHandlerThatControlsDescendantBindings === undefined
                      };
                  };
  
                  var storedBindingContextDomDataKey = "__ko_bindingContext__";
                  ko.storedBindingContextForNode = function (node, bindingContext) {
                      if (arguments.length == 2)
                          ko.utils.domData.set(node, storedBindingContextDomDataKey, bindingContext);
                      else
                          return ko.utils.domData.get(node, storedBindingContextDomDataKey);
                  }
  
                  ko.applyBindingsToNode = function (node, bindings, viewModel) {
                      if (node.nodeType === 1) // If it's an element, workaround IE <= 8 HTML parsing weirdness
                          ko.virtualElements.normaliseVirtualElementDomStructure(node);
                      return applyBindingsToNodeInternal(node, bindings, viewModel, true);
                  };
  
                  ko.applyBindingsToDescendants = function (viewModel, rootNode) {
                      if (rootNode.nodeType === 1 || rootNode.nodeType === 8)
                          applyBindingsToDescendantsInternal(viewModel, rootNode, true);
                  };
  
                  ko.applyBindings = function (viewModel, rootNode) {
                      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(viewModel, 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('applyBindingsToNode', ko.applyBindingsToNode);
                  ko.exportSymbol('contextFor', ko.contextFor);
                  ko.exportSymbol('dataFor', ko.dataFor);
              })();
              var attrHtmlToJavascriptMap = { 'class': 'className', 'for': 'htmlFor' };
              ko.bindingHandlers['attr'] = {
                  'update': function (element, valueAccessor, allBindingsAccessor) {
                      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());
                          }
                      });
                  }
              };
              ko.bindingHandlers['checked'] = {
                  'init': function (element, valueAccessor, allBindingsAccessor) {
                      var updateHandler = function () {
                          var valueToWrite;
                          if (element.type == "checkbox") {
                              valueToWrite = element.checked;
                          } else if ((element.type == "radio") && (element.checked)) {
                              valueToWrite = element.value;
                          } else {
                              return; // "checked" binding only responds to checkboxes and selected radio buttons
                          }
  
                          var modelValue = valueAccessor(), unwrappedValue = ko.utils.unwrapObservable(modelValue);
                          if ((element.type == "checkbox") && (unwrappedValue instanceof Array)) {
                              // For checkboxes bound to an array, we add/remove the checkbox value to that array
                              // This works for both observable and non-observable arrays
                              ko.utils.addOrRemoveItem(modelValue, element.value, element.checked);
                          } else {
                              ko.expressionRewriting.writeValueToProperty(modelValue, allBindingsAccessor, 'checked', valueToWrite, true);
                          }
                      };
                      ko.utils.registerEventHandler(element, "click", updateHandler);
  
                      // IE 6 won't allow radio buttons to be selected unless they have a name
                      if ((element.type == "radio") && !element.name)
                          ko.bindingHandlers['uniqueName']['init'](element, function () { return true });
                  },
                  'update': function (element, valueAccessor) {
                      var value = ko.utils.unwrapObservable(valueAccessor());
  
                      if (element.type == "checkbox") {
                          if (value instanceof Array) {
                              // When bound to an array, the checkbox being checked represents its value being present in that array
                              element.checked = ko.utils.arrayIndexOf(value, element.value) >= 0;
                          } else {
                              // When bound to any other value (not an array), the checkbox being checked represents the value being trueish
                              element.checked = value;
                          }
                      } else if (element.type == "radio") {
                          element.checked = (element.value == value);
                      }
                  }
              };
              var classesWrittenByBindingKey = '__ko__cssValue';
              ko.bindingHandlers['css'] = {
                  'update': function (element, valueAccessor) {
                      var value = ko.utils.unwrapObservable(valueAccessor());
                      if (typeof value == "object") {
                          ko.utils.objectForEach(value, function (className, shouldHaveClass) {
                              shouldHaveClass = ko.utils.unwrapObservable(shouldHaveClass);
                              ko.utils.toggleDomNodeCssClass(element, className, shouldHaveClass);
                          });
                      } else {
                          value = 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, allBindingsAccessor, viewModel) {
                          var newValueAccessor = function () {
                              var result = {};
                              result[eventName] = valueAccessor();
                              return result;
                          };
                          return ko.bindingHandlers['event']['init'].call(this, element, newValueAccessor, allBindingsAccessor, viewModel);
                      }
                  }
              }
  
              ko.bindingHandlers['event'] = {
                  'init': function (element, valueAccessor, allBindingsAccessor, viewModel) {
                      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;
                                  var allBindings = allBindingsAccessor();
  
                                  try {
                                      // Take all the event args, and prefix with the viewmodel
                                      var argsForHandler = ko.utils.makeArray(arguments);
                                      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[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, allBindingsAccessor, viewModel, bindingContext) {
                      return ko.bindingHandlers['template']['init'](element, ko.bindingHandlers['foreach'].makeTemplateValueAccessor(valueAccessor));
                  },
                  'update': function (element, valueAccessor, allBindingsAccessor, viewModel, bindingContext) {
                      return ko.bindingHandlers['template']['update'](element, ko.bindingHandlers['foreach'].makeTemplateValueAccessor(valueAccessor), allBindingsAccessor, 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, allBindingsAccessor) {
                      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, allBindingsAccessor, '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()); //force boolean to compare with last value
                      if (!element[hasfocusUpdatingProperty] && element[hasfocusLastValue] !== value) {
                          value ? element.focus() : element.blur();
                          ko.dependencyDetection.ignore(ko.utils.triggerEvent, null, [element, value ? "focusin" : "focusout"]); // For IE, which doesn't reliably fire "focus" or "blur" events synchronously
                      }
                  }
              };
  
              ko.bindingHandlers['hasFocus'] = ko.bindingHandlers['hasfocus']; // Make "hasFocus" an alias
              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());
                  }
              };
              var withIfDomDataKey = '__ko_withIfBindingData';
              // Makes a binding like with or if
              function makeWithIfBinding(bindingKey, isWith, isNot, makeContextCallback) {
                  ko.bindingHandlers[bindingKey] = {
                      'init': function (element, valueAccessor, allBindingsAccessor, viewModel, bindingContext) {
                          ko.utils.domData.set(element, withIfDomDataKey, {});
                          return { 'controlsDescendantBindings': true };
                      },
                      'update': function (element, valueAccessor, allBindingsAccessor, viewModel, bindingContext) {
                          var withIfData = ko.utils.domData.get(element, withIfDomDataKey),
                              dataValue = ko.utils.unwrapObservable(valueAccessor()),
                              shouldDisplay = !isNot !== !dataValue, // equivalent to isNot ? !dataValue : !!dataValue
                              isFirstRender = !withIfData.savedNodes,
                              needsRefresh = isFirstRender || isWith || (shouldDisplay !== withIfData.didDisplayOnLastUpdate);
  
                          if (needsRefresh) {
                              if (isFirstRender) {
                                  withIfData.savedNodes = ko.utils.cloneNodes(ko.virtualElements.childNodes(element), true /* shouldCleanNodes */);
                              }
  
                              if (shouldDisplay) {
                                  if (!isFirstRender) {
                                      ko.virtualElements.setDomNodeChildren(element, ko.utils.cloneNodes(withIfData.savedNodes));
                                  }
                                  ko.applyBindingsToDescendants(makeContextCallback ? makeContextCallback(bindingContext, dataValue) : bindingContext, element);
                              } else {
                                  ko.virtualElements.emptyNode(element);
                              }
  
                              withIfData.didDisplayOnLastUpdate = shouldDisplay;
                          }
                      }
                  };
                  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['createChildContext'](dataValue);
                  }
              );
              function ensureDropdownSelectionIsConsistentWithModelValue(element, modelValue, preferModelValue) {
                  if (preferModelValue) {
                      if (modelValue !== ko.selectExtensions.readValue(element))
                          ko.selectExtensions.writeValue(element, modelValue);
                  }
  
                  // No matter which direction we're syncing in, we want the end result to be equality between dropdown value and model value.
                  // If they aren't equal, either we prefer the dropdown value, or the model value couldn't be represented, so either way,
                  // change the model value to match the dropdown.
                  if (modelValue !== ko.selectExtensions.readValue(element))
                      ko.dependencyDetection.ignore(ko.utils.triggerEvent, null, [element, "change"]);
              };
  
              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, allBindingsAccessor) {
                      var selectWasPreviouslyEmpty = element.length == 0;
                      var previousScrollTop = (!selectWasPreviouslyEmpty && element.multiple) ? element.scrollTop : null;
  
                      var unwrappedArray = ko.utils.unwrapObservable(valueAccessor());
                      var allBindings = allBindingsAccessor();
                      var includeDestroyed = allBindings['optionsIncludeDestroyed'];
                      var captionPlaceholder = {};
                      var captionValue;
                      var previousSelectedValues;
                      if (element.multiple) {
                          previousSelectedValues = ko.utils.arrayMap(element.selectedOptions || ko.utils.arrayFilter(element.childNodes, function (node) {
                              return node.tagName && (ko.utils.tagNameLower(node) === "option") && node.selected;
                          }), function (node) {
                              return ko.selectExtensions.readValue(node);
                          });
                      } else if (element.selectedIndex >= 0) {
                          previousSelectedValues = [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
                          var 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 ('optionsCaption' in allBindings) {
                              captionValue = ko.utils.unwrapObservable(allBindings['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
                          unwrappedArray = [];
                      }
  
                      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.
                      function optionForArrayItem(arrayEntry, index, oldOptions) {
                          if (oldOptions.length) {
                              previousSelectedValues = oldOptions[0].selected && [ko.selectExtensions.readValue(oldOptions[0])];
                          }
                          var option = document.createElement("option");
                          if (arrayEntry === captionPlaceholder) {
                              ko.utils.setHtml(option, captionValue);
                              ko.selectExtensions.writeValue(option, undefined);
                          } else {
                              // Apply a value to the option element
                              var optionValue = applyToObject(arrayEntry, allBindings['optionsValue'], arrayEntry);
                              ko.selectExtensions.writeValue(option, ko.utils.unwrapObservable(optionValue));
  
                              // Apply some text to the option element
                              var optionText = applyToObject(arrayEntry, allBindings['optionsText'], optionValue);
                              ko.utils.setTextContent(option, optionText);
                          }
                          return [option];
                      }
  
                      function setSelectionCallback(arrayEntry, newOptions) {
                          // 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.
                          if (previousSelectedValues) {
                              var isSelected = ko.utils.arrayIndexOf(previousSelectedValues, ko.selectExtensions.readValue(newOptions[0])) >= 0;
                              ko.utils.setOptionNodeSelectionState(newOptions[0], isSelected);
                          }
                      }
  
                      var callback = setSelectionCallback;
                      if (allBindings['optionsAfterRender']) {
                          callback = function (arrayEntry, newOptions) {
                              setSelectionCallback(arrayEntry, newOptions);
                              ko.dependencyDetection.ignore(allBindings['optionsAfterRender'], null, [newOptions[0], arrayEntry !== captionPlaceholder ? arrayEntry : undefined]);
                          }
                      }
  
                      ko.utils.setDomNodeChildrenFromArrayMapping(element, filteredArray, optionForArrayItem, null, callback);
  
                      // Clear previousSelectedValues so that future updates to individual objects don't get stale data
                      previousSelectedValues = null;
  
                      if (selectWasPreviouslyEmpty && ('value' in allBindings)) {
                          // Ensure consistency between model value and selected option.
                          // If the dropdown is being populated for the first time here (or was otherwise previously empty),
                          // the dropdown selection state is meaningless, so we preserve the model value.
                          ensureDropdownSelectionIsConsistentWithModelValue(element, ko.utils.peekObservable(allBindings['value']), /* preferModelValue */ true);
                      }
  
                      // Workaround for IE bug
                      ko.utils.ensureSelectElementIsRenderedCorrectly(element);
  
                      if (previousScrollTop && Math.abs(previousScrollTop - element.scrollTop) > 20)
                          element.scrollTop = previousScrollTop;
                  }
              };
              ko.bindingHandlers['options'].optionValueDomDataKey = '__ko.optionValueDomData__';
              ko.bindingHandlers['selectedOptions'] = {
                  'init': function (element, valueAccessor, allBindingsAccessor) {
                      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, allBindingsAccessor, '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());
                      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;
                              ko.utils.setOptionNodeSelectionState(node, isSelected);
                          });
                      }
                  }
              };
              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);
                          element.style[styleName] = styleValue || ""; // Empty string removes the value, whereas null/undefined have no effect
                      });
                  }
              };
              ko.bindingHandlers['submit'] = {
                  'init': function (element, valueAccessor, allBindingsAccessor, viewModel) {
                      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(viewModel, 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'] = {
                  'update': function (element, valueAccessor) {
                      ko.utils.setTextContent(element, valueAccessor());
                  }
              };
              ko.virtualElements.allowedBindings['text'] = true;
              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'] = {
                  'init': function (element, valueAccessor, allBindingsAccessor) {
                      // Always catch "change" event; possibly other events too if asked
                      var eventsToCatch = ["change"];
                      var requestedEventsToCatch = allBindingsAccessor()["valueUpdate"];
                      var propertyChangedFired = false;
                      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 () {
                          propertyChangedFired = false;
                          var modelValue = valueAccessor();
                          var elementValue = ko.selectExtensions.readValue(element);
                          ko.expressionRewriting.writeValueToProperty(modelValue, allBindingsAccessor, '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, "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 () { setTimeout(valueUpdateHandler, 0) };
                              eventName = eventName.substring("after".length);
                          }
                          ko.utils.registerEventHandler(element, eventName, handler);
                      });
                  },
                  'update': function (element, valueAccessor) {
                      var valueIsSelectOption = ko.utils.tagNameLower(element) === "select";
                      var newValue = ko.utils.unwrapObservable(valueAccessor());
                      var elementValue = ko.selectExtensions.readValue(element);
                      var valueHasChanged = (newValue !== elementValue);
  
                      if (valueHasChanged) {
                          var applyValueAction = function () { ko.selectExtensions.writeValue(element, newValue); };
                          applyValueAction();
  
                          // 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.
                          var alsoApplyAsynchronously = valueIsSelectOption;
                          if (alsoApplyAsynchronously)
                              setTimeout(applyValueAction, 0);
                      }
  
                      // 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.
                      if (valueIsSelectOption && (element.length > 0))
                          ensureDropdownSelectionIsConsistentWithModelValue(element, newValue, /* preferModelValue */ false);
                  }
              };
              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 }"
              //            //
              //            // 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) {
                  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);
              };
  
              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);
  
                      // 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.applyBindingsToNode(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 -----
  
                  ko.templateSources.domElement = function (element) {
                      this.domElement = element;
                  }
  
                  ko.templateSources.domElement.prototype['text'] = function (/* valueToWrite */) {
                      var tagNameLower = ko.utils.tagNameLower(this.domElement),
                          elemContentsProperty = tagNameLower === "script" ? "text"
                              : tagNameLower === "textarea" ? "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;
                      }
                  };
  
                  ko.templateSources.domElement.prototype['data'] = function (key /*, valueToWrite */) {
                      if (arguments.length === 1) {
                          return ko.utils.domData.get(this.domElement, "templateSourceData_" + key);
                      } else {
                          ko.utils.domData.set(this.domElement, "templateSourceData_" + key, arguments[1]);
                      }
                  };
  
                  // ---- 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.
  
                  var anonymousTemplatesDomDataKey = "__ko_anon_template__";
                  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 = ko.utils.domData.get(this.domElement, anonymousTemplatesDomDataKey) || {};
                          if (templateData.textData === undefined && templateData.containerData)
                              templateData.textData = templateData.containerData.innerHTML;
                          return templateData.textData;
                      } else {
                          var valueToWrite = arguments[0];
                          ko.utils.domData.set(this.domElement, anonymousTemplatesDomDataKey, { textData: valueToWrite });
                      }
                  };
                  ko.templateSources.domElement.prototype['nodes'] = function (/* valueToWrite */) {
                      if (arguments.length == 0) {
                          var templateData = ko.utils.domData.get(this.domElement, anonymousTemplatesDomDataKey) || {};
                          return templateData.containerData;
                      } else {
                          var valueToWrite = arguments[0];
                          ko.utils.domData.set(this.domElement, anonymousTemplatesDomDataKey, { containerData: 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 invokeForEachNodeOrCommentInContinuousRange(firstNode, lastNode, action) {
                      var node, nextInQueue = firstNode, firstOutOfRangeNode = ko.virtualElements.nextSibling(lastNode);
                      while (nextInQueue && ((node = nextInQueue) !== firstOutOfRangeNode)) {
                          nextInQueue = ko.virtualElements.nextSibling(node);
                          if (node.nodeType === 1 || node.nodeType === 8)
                              action(node);
                      }
                  }
  
                  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];
  
                          // 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
                          invokeForEachNodeOrCommentInContinuousRange(firstNode, lastNode, function (node) {
                              ko.applyBindings(bindingContext, node);
                          });
                          invokeForEachNodeOrCommentInContinuousRange(firstNode, lastNode, function (node) {
                              ko.memoization.unmemoizeDomNodeAndDescendants(node, [bindingContext]);
                          });
                      }
                  }
  
                  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 && firstTargetNode.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;
                  }
  
                  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(ko.utils.unwrapObservable(dataOrBindingContext));
  
                                  // Support selecting template as a function of the data being rendered
                                  var templateName = typeof (template) == 'function' ? template(bindingContext['$data'], bindingContext) : template;
  
                                  var 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'](ko.utils.unwrapObservable(arrayValue), options['as']);
                          arrayItemContext['$index'] = index;
                          var templateName = typeof (template) == 'function' ? template(arrayValue, arrayItemContext) : template;
                          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);
                      };
  
                      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__templateComputedDomDataKey__';
                  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']) && (element.nodeType == 1 || element.nodeType == 8)) {
                              // It's an anonymous template - store the element contents, then clear the element
                              var templateNodes = element.nodeType == 1 ? element.childNodes : 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, allBindingsAccessor, viewModel, bindingContext) {
                          var templateName = ko.utils.unwrapObservable(valueAccessor()),
                              options = {},
                              shouldDisplay = true,
                              dataValue,
                              templateComputed = null;
  
                          if (typeof templateName != "string") {
                              options = templateName;
                              templateName = ko.utils.unwrapObservable(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']);
  
                              dataValue = ko.utils.unwrapObservable(options['data']);
                          }
  
                          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['createChildContext'](dataValue, 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);
  
              ko.utils.compareArrays = (function () {
                  var statusNotInOld = 'added', statusNotInNew = 'deleted';
  
                  // Simple calculation based on Levenshtein distance.
                  function compareArrays(oldArray, newArray, dontLimitMoves) {
                      oldArray = oldArray || [];
                      newArray = newArray || [];
  
                      if (oldArray.length <= newArray.length)
                          return compareSmallArrayToBigArray(oldArray, newArray, statusNotInOld, statusNotInNew, dontLimitMoves);
                      else
                          return compareSmallArrayToBigArray(newArray, oldArray, statusNotInNew, statusNotInOld, dontLimitMoves);
                  }
  
                  function compareSmallArrayToBigArray(smlArray, bigArray, statusNotInSml, statusNotInBig, dontLimitMoves) {
                      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 {
                              editScript.push({
                                  'status': "retained",
                                  'value': bigArray[--bigIndex]
                              });
                              --smlIndex;
                          }
                      }
  
                      if (notInSml.length && notInBig.length) {
                          // 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.
                          var limitFailedCompares = smlIndexMax * 10, failedCompares,
                              a, d, notInSmlItem, notInBigItem;
                          // Go through the items that have been added and deleted and try to find matches between them.
                          for (failedCompares = a = 0; (dontLimitMoves || failedCompares < limitFailedCompares) && (notInSmlItem = notInSml[a]); a++) {
                              for (d = 0; notInBigItem = notInBig[d]; d++) {
                                  if (notInSmlItem['value'] === notInBigItem['value']) {
                                      notInSmlItem['moved'] = notInBigItem['index'];
                                      notInBigItem['moved'] = notInSmlItem['index'];
                                      notInBig.splice(d, 1);       // This item is marked as moved; so remove it from notInBig list
                                      failedCompares = d = 0;     // Reset failed compares count because we're checking for consecutive failures
                                      break;
                                  }
                              }
                              failedCompares += d;
                          }
                      }
                      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 fixUpNodesToBeMovedOrRemoved(contiguousNodeArray) {
                      // Before moving, deleting, or replacing a set of nodes that were previously outputted by the "map" 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 from the document,
                      // 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 what set of current DOM nodes should be removed.
                      //
                      // Rules:
                      //   [A] Any leading nodes that aren't in the document any more should be ignored
                      //       These most likely correspond to memoization nodes that were already removed during binding
                      //       See https://github.com/SteveSanderson/knockout/pull/440
                      //   [B] We want to output a contiguous series of nodes that are still in the document. So, ignore any nodes that
                      //       have already been removed, and include any nodes that have been inserted among the previous collection
  
                      // Rule [A]
                      while (contiguousNodeArray.length && !ko.utils.domNodeIsAttachedToDocument(contiguousNodeArray[0]))
                          contiguousNodeArray.splice(0, 1);
  
                      // Rule [B]
                      if (contiguousNodeArray.length > 1) {
                          // Build up the actual new contiguous node set
                          var current = contiguousNodeArray[0], last = contiguousNodeArray[contiguousNodeArray.length - 1], newContiguousSet = [current];
                          while (current !== last) {
                              current = current.nextSibling;
                              if (!current) // Won't happen, except if the developer has manually removed some DOM elements (then we're in an undefined scenario)
                                  return;
                              newContiguousSet.push(current);
                          }
  
                          // ... then mutate the input array to match this.
                          // (The following line replaces the contents of contiguousNodeArray with newContiguousSet)
                          Array.prototype.splice.apply(contiguousNodeArray, [0, contiguousNodeArray.length].concat(newContiguousSet));
                      }
                      return contiguousNodeArray;
                  }
  
                  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, fixUpNodesToBeMovedOrRemoved(mappedNodes)) || [];
  
                          // 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.splice(0, mappedNodes.length);
                          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 = "setDomNodeChildrenFromArrayMapping_lastMappingResult";
  
                  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 fixUpNodesToBeMovedOrRemoved
                          mapData.indexObservable(newMappingResultIndex++);
                          fixUpNodesToBeMovedOrRemoved(mapData.mappedNodes);
                          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();
  
                                      // Queue these nodes for later removal
                                      nodesToDelete.push.apply(nodesToDelete, fixUpNodesToBeMovedOrRemoved(mapData.mappedNodes));
                                      if (options['beforeRemove']) {
                                          itemsForBeforeRemoveCallbacks[i] = mapData;
                                          itemsToProcess.push(mapData);
                                      }
                                  }
                                  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;
                          }
                      }
  
                      // 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);
  
                      // Finally call afterMove and afterAdd callbacks
                      callCallback(options['afterMove'], itemsForMoveCallbacks);
                      callCallback(options['afterAdd'], itemsForAfterAddCallbacks);
  
                      // Store a copy of the array items we just considered so we can difference it next time
                      ko.utils.domData.set(domNode, lastMappingResultDomDataKey, newMappingResult);
                  }
              })();
  
              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) {
                  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);
                  }
              };
  
              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 ((typeof (jQuery) == "undefined") || !(jQuery['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 (jQuery['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 jQuery['tmpl'](compiledTemplate, data, jQueryTemplateOptions);
                      }
  
                      this['renderTemplateSource'] = function (templateSource, bindingContext, options) {
                          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 = jQuery['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 = jQuery['extend']({ 'koBindingContext': bindingContext }, options['templateOptions']);
  
                          var resultNodes = executeTemplate(precompiled, data, jQueryTemplateOptions);
                          resultNodes['appendTo'](document.createElement("div")); // Using "appendTo" forces jQuery/jQuery.tmpl to perform necessary cleanup work
  
                          jQuery['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) {
                          jQuery['tmpl']['tag']['ko_code'] = {
                              open: "__.push($1 || '');"
                          };
                          jQuery['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);
              })();
          }));
      }());
  })();