text: /*!
   * https://github.com/es-shims/es5-shim
   * @license es5-shim Copyright 2009-2015 by contributors, MIT License
   * see https://github.com/es-shims/es5-shim/blob/master/LICENSE
   */
  
  // vim: ts=4 sts=4 sw=4 expandtab
  
  // Add semicolon to prevent IIFE from being passed as argument to concatenated code.
  ;
  
  // UMD (Universal Module Definition)
  // see https://github.com/umdjs/umd/blob/master/templates/returnExports.js
  (function (root, factory) {
      'use strict';
  
      /* global define, exports, module */
      if (typeof define === 'function' && define.amd) {
          // AMD. Register as an anonymous module.
          define(factory);
      } else if (typeof exports === 'object') {
          // Node. Does not work with strict CommonJS, but
          // only CommonJS-like enviroments that support module.exports,
          // like Node.
          module.exports = factory();
      } else {
          // Browser globals (root is window)
          root.returnExports = factory();
      }
  }(this, function () {
      /**
       * Brings an environment as close to ECMAScript 5 compliance
       * as is possible with the facilities of erstwhile engines.
       *
       * Annotated ES5: http://es5.github.com/ (specific links below)
       * ES5 Spec: http://www.ecma-international.org/publications/files/ECMA-ST/Ecma-262.pdf
       * Required reading: http://javascriptweblog.wordpress.com/2011/12/05/extending-javascript-natives/
       */
  
      // Shortcut to an often accessed properties, in order to avoid multiple
      // dereference that costs universally. This also holds a reference to known-good
      // functions.
      var $Array = Array;
      var ArrayPrototype = $Array.prototype;
      var $Object = Object;
      var ObjectPrototype = $Object.prototype;
      var $Function = Function;
      var FunctionPrototype = $Function.prototype;
      var $String = String;
      var StringPrototype = $String.prototype;
      var $Number = Number;
      var NumberPrototype = $Number.prototype;
      var array_slice = ArrayPrototype.slice;
      var array_splice = ArrayPrototype.splice;
      var array_push = ArrayPrototype.push;
      var array_unshift = ArrayPrototype.unshift;
      var array_concat = ArrayPrototype.concat;
      var array_join = ArrayPrototype.join;
      var call = FunctionPrototype.call;
      var apply = FunctionPrototype.apply;
      var max = Math.max;
      var min = Math.min;
  
      // Having a toString local variable name breaks in Opera so use to_string.
      var to_string = ObjectPrototype.toString;
  
      /* global Symbol */
      /* eslint-disable one-var-declaration-per-line, no-redeclare, max-statements-per-line */
      var hasToStringTag = typeof Symbol === 'function' && typeof Symbol.toStringTag === 'symbol';
      var isCallable; /* inlined from https://npmjs.com/is-callable */ var fnToStr = Function.prototype.toString, constructorRegex = /^\s*class /, isES6ClassFn = function isES6ClassFn(value) { try { var fnStr = fnToStr.call(value); var singleStripped = fnStr.replace(/\/\/.*\n/g, ''); var multiStripped = singleStripped.replace(/\/\*[.\s\S]*\*\//g, ''); var spaceStripped = multiStripped.replace(/\n/mg, ' ').replace(/ {2}/g, ' '); return constructorRegex.test(spaceStripped); } catch (e) { return false; /* not a function */ } }, tryFunctionObject = function tryFunctionObject(value) { try { if (isES6ClassFn(value)) { return false; } fnToStr.call(value); return true; } catch (e) { return false; } }, fnClass = '[object Function]', genClass = '[object GeneratorFunction]', isCallable = function isCallable(value) { if (!value) { return false; } if (typeof value !== 'function' && typeof value !== 'object') { return false; } if (hasToStringTag) { return tryFunctionObject(value); } if (isES6ClassFn(value)) { return false; } var strClass = to_string.call(value); return strClass === fnClass || strClass === genClass; };
  
      var isRegex; /* inlined from https://npmjs.com/is-regex */ var regexExec = RegExp.prototype.exec, tryRegexExec = function tryRegexExec(value) { try { regexExec.call(value); return true; } catch (e) { return false; } }, regexClass = '[object RegExp]'; isRegex = function isRegex(value) { if (typeof value !== 'object') { return false; } return hasToStringTag ? tryRegexExec(value) : to_string.call(value) === regexClass; };
      var isString; /* inlined from https://npmjs.com/is-string */ var strValue = String.prototype.valueOf, tryStringObject = function tryStringObject(value) { try { strValue.call(value); return true; } catch (e) { return false; } }, stringClass = '[object String]'; isString = function isString(value) { if (typeof value === 'string') { return true; } if (typeof value !== 'object') { return false; } return hasToStringTag ? tryStringObject(value) : to_string.call(value) === stringClass; };
      /* eslint-enable one-var-declaration-per-line, no-redeclare, max-statements-per-line */
  
      /* inlined from http://npmjs.com/define-properties */
      var supportsDescriptors = $Object.defineProperty && (function () {
          try {
              var obj = {};
              $Object.defineProperty(obj, 'x', { enumerable: false, value: obj });
              for (var _ in obj) { // jscs:ignore disallowUnusedVariables
                  return false;
              }
              return obj.x === obj;
          } catch (e) { /* this is ES3 */
              return false;
          }
      }());
      var defineProperties = (function (has) {
          // Define configurable, writable, and non-enumerable props
          // if they don't exist.
          var defineProperty;
          if (supportsDescriptors) {
              defineProperty = function (object, name, method, forceAssign) {
                  if (!forceAssign && (name in object)) {
                      return;
                  }
                  $Object.defineProperty(object, name, {
                      configurable: true,
                      enumerable: false,
                      writable: true,
                      value: method
                  });
              };
          } else {
              defineProperty = function (object, name, method, forceAssign) {
                  if (!forceAssign && (name in object)) {
                      return;
                  }
                  object[name] = method;
              };
          }
          return function defineProperties(object, map, forceAssign) {
              for (var name in map) {
                  if (has.call(map, name)) {
                      defineProperty(object, name, map[name], forceAssign);
                  }
              }
          };
      }(ObjectPrototype.hasOwnProperty));
  
      //
      // Util
      // ======
      //
  
      /* replaceable with https://npmjs.com/package/es-abstract /helpers/isPrimitive */
      var isPrimitive = function isPrimitive(input) {
          var type = typeof input;
          return input === null || (type !== 'object' && type !== 'function');
      };
  
      var isActualNaN = $Number.isNaN || function isActualNaN(x) {
          return x !== x;
      };
  
      var ES = {
          // ES5 9.4
          // http://es5.github.com/#x9.4
          // http://jsperf.com/to-integer
          /* replaceable with https://npmjs.com/package/es-abstract ES5.ToInteger */
          ToInteger: function ToInteger(num) {
              var n = +num;
              if (isActualNaN(n)) {
                  n = 0;
              } else if (n !== 0 && n !== (1 / 0) && n !== -(1 / 0)) {
                  n = (n > 0 || -1) * Math.floor(Math.abs(n));
              }
              return n;
          },
  
          /* replaceable with https://npmjs.com/package/es-abstract ES5.ToPrimitive */
          ToPrimitive: function ToPrimitive(input) {
              var val, valueOf, toStr;
              if (isPrimitive(input)) {
                  return input;
              }
              valueOf = input.valueOf;
              if (isCallable(valueOf)) {
                  val = valueOf.call(input);
                  if (isPrimitive(val)) {
                      return val;
                  }
              }
              toStr = input.toString;
              if (isCallable(toStr)) {
                  val = toStr.call(input);
                  if (isPrimitive(val)) {
                      return val;
                  }
              }
              throw new TypeError();
          },
  
          // ES5 9.9
          // http://es5.github.com/#x9.9
          /* replaceable with https://npmjs.com/package/es-abstract ES5.ToObject */
          ToObject: function (o) {
              if (o == null) { // this matches both null and undefined
                  throw new TypeError("can't convert " + o + ' to object');
              }
              return $Object(o);
          },
  
          /* replaceable with https://npmjs.com/package/es-abstract ES5.ToUint32 */
          ToUint32: function ToUint32(x) {
              return x >>> 0;
          }
      };
  
      //
      // Function
      // ========
      //
  
      // ES-5 15.3.4.5
      // http://es5.github.com/#x15.3.4.5
  
      var Empty = function Empty() {};
  
      defineProperties(FunctionPrototype, {
          bind: function bind(that) { // .length is 1
              // 1. Let Target be the this value.
              var target = this;
              // 2. If IsCallable(Target) is false, throw a TypeError exception.
              if (!isCallable(target)) {
                  throw new TypeError('Function.prototype.bind called on incompatible ' + target);
              }
              // 3. Let A be a new (possibly empty) internal list of all of the
              //   argument values provided after thisArg (arg1, arg2 etc), in order.
              // XXX slicedArgs will stand in for "A" if used
              var args = array_slice.call(arguments, 1); // for normal call
              // 4. Let F be a new native ECMAScript object.
              // 11. Set the [[Prototype]] internal property of F to the standard
              //   built-in Function prototype object as specified in 15.3.3.1.
              // 12. Set the [[Call]] internal property of F as described in
              //   15.3.4.5.1.
              // 13. Set the [[Construct]] internal property of F as described in
              //   15.3.4.5.2.
              // 14. Set the [[HasInstance]] internal property of F as described in
              //   15.3.4.5.3.
              var bound;
              var binder = function () {
  
                  if (this instanceof bound) {
                      // 15.3.4.5.2 [[Construct]]
                      // When the [[Construct]] internal method of a function object,
                      // F that was created using the bind function is called with a
                      // list of arguments ExtraArgs, the following steps are taken:
                      // 1. Let target be the value of F's [[TargetFunction]]
                      //   internal property.
                      // 2. If target has no [[Construct]] internal method, a
                      //   TypeError exception is thrown.
                      // 3. Let boundArgs be the value of F's [[BoundArgs]] internal
                      //   property.
                      // 4. Let args be a new list containing the same values as the
                      //   list boundArgs in the same order followed by the same
                      //   values as the list ExtraArgs in the same order.
                      // 5. Return the result of calling the [[Construct]] internal
                      //   method of target providing args as the arguments.
  
                      var result = apply.call(
                          target,
                          this,
                          array_concat.call(args, array_slice.call(arguments))
                      );
                      if ($Object(result) === result) {
                          return result;
                      }
                      return this;
  
                  } else {
                      // 15.3.4.5.1 [[Call]]
                      // When the [[Call]] internal method of a function object, F,
                      // which was created using the bind function is called with a
                      // this value and a list of arguments ExtraArgs, the following
                      // steps are taken:
                      // 1. Let boundArgs be the value of F's [[BoundArgs]] internal
                      //   property.
                      // 2. Let boundThis be the value of F's [[BoundThis]] internal
                      //   property.
                      // 3. Let target be the value of F's [[TargetFunction]] internal
                      //   property.
                      // 4. Let args be a new list containing the same values as the
                      //   list boundArgs in the same order followed by the same
                      //   values as the list ExtraArgs in the same order.
                      // 5. Return the result of calling the [[Call]] internal method
                      //   of target providing boundThis as the this value and
                      //   providing args as the arguments.
  
                      // equiv: target.call(this, ...boundArgs, ...args)
                      return apply.call(
                          target,
                          that,
                          array_concat.call(args, array_slice.call(arguments))
                      );
  
                  }
  
              };
  
              // 15. If the [[Class]] internal property of Target is "Function", then
              //     a. Let L be the length property of Target minus the length of A.
              //     b. Set the length own property of F to either 0 or L, whichever is
              //       larger.
              // 16. Else set the length own property of F to 0.
  
              var boundLength = max(0, target.length - args.length);
  
              // 17. Set the attributes of the length own property of F to the values
              //   specified in 15.3.5.1.
              var boundArgs = [];
              for (var i = 0; i < boundLength; i++) {
                  array_push.call(boundArgs, '$' + i);
              }
  
              // XXX Build a dynamic function with desired amount of arguments is the only
              // way to set the length property of a function.
              // In environments where Content Security Policies enabled (Chrome extensions,
              // for ex.) all use of eval or Function costructor throws an exception.
              // However in all of these environments Function.prototype.bind exists
              // and so this code will never be executed.
              bound = $Function('binder', 'return function (' + array_join.call(boundArgs, ',') + '){ return binder.apply(this, arguments); }')(binder);
  
              if (target.prototype) {
                  Empty.prototype = target.prototype;
                  bound.prototype = new Empty();
                  // Clean up dangling references.
                  Empty.prototype = null;
              }
  
              // TODO
              // 18. Set the [[Extensible]] internal property of F to true.
  
              // TODO
              // 19. Let thrower be the [[ThrowTypeError]] function Object (13.2.3).
              // 20. Call the [[DefineOwnProperty]] internal method of F with
              //   arguments "caller", PropertyDescriptor {[[Get]]: thrower, [[Set]]:
              //   thrower, [[Enumerable]]: false, [[Configurable]]: false}, and
              //   false.
              // 21. Call the [[DefineOwnProperty]] internal method of F with
              //   arguments "arguments", PropertyDescriptor {[[Get]]: thrower,
              //   [[Set]]: thrower, [[Enumerable]]: false, [[Configurable]]: false},
              //   and false.
  
              // TODO
              // NOTE Function objects created using Function.prototype.bind do not
              // have a prototype property or the [[Code]], [[FormalParameters]], and
              // [[Scope]] internal properties.
              // XXX can't delete prototype in pure-js.
  
              // 22. Return F.
              return bound;
          }
      });
  
      // _Please note: Shortcuts are defined after `Function.prototype.bind` as we
      // use it in defining shortcuts.
      var owns = call.bind(ObjectPrototype.hasOwnProperty);
      var toStr = call.bind(ObjectPrototype.toString);
      var arraySlice = call.bind(array_slice);
      var arraySliceApply = apply.bind(array_slice);
      /* globals document */
      if (typeof document === 'object' && document && document.documentElement) {
          try {
              arraySlice(document.documentElement.childNodes);
          } catch (e) {
              var origArraySlice = arraySlice;
              var origArraySliceApply = arraySliceApply;
              arraySlice = function arraySliceIE(arr) {
                  var r = [];
                  var i = arr.length;
                  while (i-- > 0) {
                      r[i] = arr[i];
                  }
                  return origArraySliceApply(r, origArraySlice(arguments, 1));
              };
              arraySliceApply = function arraySliceApplyIE(arr, args) {
                  return origArraySliceApply(arraySlice(arr), args);
              };
          }
      }
      var strSlice = call.bind(StringPrototype.slice);
      var strSplit = call.bind(StringPrototype.split);
      var strIndexOf = call.bind(StringPrototype.indexOf);
      var pushCall = call.bind(array_push);
      var isEnum = call.bind(ObjectPrototype.propertyIsEnumerable);
      var arraySort = call.bind(ArrayPrototype.sort);
  
      //
      // Array
      // =====
      //
  
      var isArray = $Array.isArray || function isArray(obj) {
          return toStr(obj) === '[object Array]';
      };
  
      // ES5 15.4.4.12
      // http://es5.github.com/#x15.4.4.13
      // Return len+argCount.
      // [bugfix, ielt8]
      // IE < 8 bug: [].unshift(0) === undefined but should be "1"
      var hasUnshiftReturnValueBug = [].unshift(0) !== 1;
      defineProperties(ArrayPrototype, {
          unshift: function () {
              array_unshift.apply(this, arguments);
              return this.length;
          }
      }, hasUnshiftReturnValueBug);
  
      // ES5 15.4.3.2
      // http://es5.github.com/#x15.4.3.2
      // https://developer.mozilla.org/en/JavaScript/Reference/Global_Objects/Array/isArray
      defineProperties($Array, { isArray: isArray });
  
      // The IsCallable() check in the Array functions
      // has been replaced with a strict check on the
      // internal class of the object to trap cases where
      // the provided function was actually a regular
      // expression literal, which in V8 and
      // JavaScriptCore is a typeof "function".  Only in
      // V8 are regular expression literals permitted as
      // reduce parameters, so it is desirable in the
      // general case for the shim to match the more
      // strict and common behavior of rejecting regular
      // expressions.
  
      // ES5 15.4.4.18
      // http://es5.github.com/#x15.4.4.18
      // https://developer.mozilla.org/en/JavaScript/Reference/Global_Objects/array/forEach
  
      // Check failure of by-index access of string characters (IE < 9)
      // and failure of `0 in boxedString` (Rhino)
      var boxedString = $Object('a');
      var splitString = boxedString[0] !== 'a' || !(0 in boxedString);
  
      var properlyBoxesContext = function properlyBoxed(method) {
          // Check node 0.6.21 bug where third parameter is not boxed
          var properlyBoxesNonStrict = true;
          var properlyBoxesStrict = true;
          var threwException = false;
          if (method) {
              try {
                  method.call('foo', function (_, __, context) {
                      if (typeof context !== 'object') {
                          properlyBoxesNonStrict = false;
                      }
                  });
  
                  method.call([1], function () {
                      'use strict';
  
                      properlyBoxesStrict = typeof this === 'string';
                  }, 'x');
              } catch (e) {
                  threwException = true;
              }
          }
          return !!method && !threwException && properlyBoxesNonStrict && properlyBoxesStrict;
      };
  
      defineProperties(ArrayPrototype, {
          forEach: function forEach(callbackfn/*, thisArg*/) {
              var object = ES.ToObject(this);
              var self = splitString && isString(this) ? strSplit(this, '') : object;
              var i = -1;
              var length = ES.ToUint32(self.length);
              var T;
              if (arguments.length > 1) {
                  T = arguments[1];
              }
  
              // If no callback function or if callback is not a callable function
              if (!isCallable(callbackfn)) {
                  throw new TypeError('Array.prototype.forEach callback must be a function');
              }
  
              while (++i < length) {
                  if (i in self) {
                      // Invoke the callback function with call, passing arguments:
                      // context, property value, property key, thisArg object
                      if (typeof T === 'undefined') {
                          callbackfn(self[i], i, object);
                      } else {
                          callbackfn.call(T, self[i], i, object);
                      }
                  }
              }
          }
      }, !properlyBoxesContext(ArrayPrototype.forEach));
  
      // ES5 15.4.4.19
      // http://es5.github.com/#x15.4.4.19
      // https://developer.mozilla.org/en/Core_JavaScript_1.5_Reference/Objects/Array/map
      defineProperties(ArrayPrototype, {
          map: function map(callbackfn/*, thisArg*/) {
              var object = ES.ToObject(this);
              var self = splitString && isString(this) ? strSplit(this, '') : object;
              var length = ES.ToUint32(self.length);
              var result = $Array(length);
              var T;
              if (arguments.length > 1) {
                  T = arguments[1];
              }
  
              // If no callback function or if callback is not a callable function
              if (!isCallable(callbackfn)) {
                  throw new TypeError('Array.prototype.map callback must be a function');
              }
  
              for (var i = 0; i < length; i++) {
                  if (i in self) {
                      if (typeof T === 'undefined') {
                          result[i] = callbackfn(self[i], i, object);
                      } else {
                          result[i] = callbackfn.call(T, self[i], i, object);
                      }
                  }
              }
              return result;
          }
      }, !properlyBoxesContext(ArrayPrototype.map));
  
      // ES5 15.4.4.20
      // http://es5.github.com/#x15.4.4.20
      // https://developer.mozilla.org/en/Core_JavaScript_1.5_Reference/Objects/Array/filter
      defineProperties(ArrayPrototype, {
          filter: function filter(callbackfn/*, thisArg*/) {
              var object = ES.ToObject(this);
              var self = splitString && isString(this) ? strSplit(this, '') : object;
              var length = ES.ToUint32(self.length);
              var result = [];
              var value;
              var T;
              if (arguments.length > 1) {
                  T = arguments[1];
              }
  
              // If no callback function or if callback is not a callable function
              if (!isCallable(callbackfn)) {
                  throw new TypeError('Array.prototype.filter callback must be a function');
              }
  
              for (var i = 0; i < length; i++) {
                  if (i in self) {
                      value = self[i];
                      if (typeof T === 'undefined' ? callbackfn(value, i, object) : callbackfn.call(T, value, i, object)) {
                          pushCall(result, value);
                      }
                  }
              }
              return result;
          }
      }, !properlyBoxesContext(ArrayPrototype.filter));
  
      // ES5 15.4.4.16
      // http://es5.github.com/#x15.4.4.16
      // https://developer.mozilla.org/en/JavaScript/Reference/Global_Objects/Array/every
      defineProperties(ArrayPrototype, {
          every: function every(callbackfn/*, thisArg*/) {
              var object = ES.ToObject(this);
              var self = splitString && isString(this) ? strSplit(this, '') : object;
              var length = ES.ToUint32(self.length);
              var T;
              if (arguments.length > 1) {
                  T = arguments[1];
              }
  
              // If no callback function or if callback is not a callable function
              if (!isCallable(callbackfn)) {
                  throw new TypeError('Array.prototype.every callback must be a function');
              }
  
              for (var i = 0; i < length; i++) {
                  if (i in self && !(typeof T === 'undefined' ? callbackfn(self[i], i, object) : callbackfn.call(T, self[i], i, object))) {
                      return false;
                  }
              }
              return true;
          }
      }, !properlyBoxesContext(ArrayPrototype.every));
  
      // ES5 15.4.4.17
      // http://es5.github.com/#x15.4.4.17
      // https://developer.mozilla.org/en/JavaScript/Reference/Global_Objects/Array/some
      defineProperties(ArrayPrototype, {
          some: function some(callbackfn/*, thisArg */) {
              var object = ES.ToObject(this);
              var self = splitString && isString(this) ? strSplit(this, '') : object;
              var length = ES.ToUint32(self.length);
              var T;
              if (arguments.length > 1) {
                  T = arguments[1];
              }
  
              // If no callback function or if callback is not a callable function
              if (!isCallable(callbackfn)) {
                  throw new TypeError('Array.prototype.some callback must be a function');
              }
  
              for (var i = 0; i < length; i++) {
                  if (i in self && (typeof T === 'undefined' ? callbackfn(self[i], i, object) : callbackfn.call(T, self[i], i, object))) {
                      return true;
                  }
              }
              return false;
          }
      }, !properlyBoxesContext(ArrayPrototype.some));
  
      // ES5 15.4.4.21
      // http://es5.github.com/#x15.4.4.21
      // https://developer.mozilla.org/en/Core_JavaScript_1.5_Reference/Objects/Array/reduce
      var reduceCoercesToObject = false;
      if (ArrayPrototype.reduce) {
          reduceCoercesToObject = typeof ArrayPrototype.reduce.call('es5', function (_, __, ___, list) {
              return list;
          }) === 'object';
      }
      defineProperties(ArrayPrototype, {
          reduce: function reduce(callbackfn/*, initialValue*/) {
              var object = ES.ToObject(this);
              var self = splitString && isString(this) ? strSplit(this, '') : object;
              var length = ES.ToUint32(self.length);
  
              // If no callback function or if callback is not a callable function
              if (!isCallable(callbackfn)) {
                  throw new TypeError('Array.prototype.reduce callback must be a function');
              }
  
              // no value to return if no initial value and an empty array
              if (length === 0 && arguments.length === 1) {
                  throw new TypeError('reduce of empty array with no initial value');
              }
  
              var i = 0;
              var result;
              if (arguments.length >= 2) {
                  result = arguments[1];
              } else {
                  do {
                      if (i in self) {
                          result = self[i++];
                          break;
                      }
  
                      // if array contains no values, no initial value to return
                      if (++i >= length) {
                          throw new TypeError('reduce of empty array with no initial value');
                      }
                  } while (true);
              }
  
              for (; i < length; i++) {
                  if (i in self) {
                      result = callbackfn(result, self[i], i, object);
                  }
              }
  
              return result;
          }
      }, !reduceCoercesToObject);
  
      // ES5 15.4.4.22
      // http://es5.github.com/#x15.4.4.22
      // https://developer.mozilla.org/en/Core_JavaScript_1.5_Reference/Objects/Array/reduceRight
      var reduceRightCoercesToObject = false;
      if (ArrayPrototype.reduceRight) {
          reduceRightCoercesToObject = typeof ArrayPrototype.reduceRight.call('es5', function (_, __, ___, list) {
              return list;
          }) === 'object';
      }
      defineProperties(ArrayPrototype, {
          reduceRight: function reduceRight(callbackfn/*, initial*/) {
              var object = ES.ToObject(this);
              var self = splitString && isString(this) ? strSplit(this, '') : object;
              var length = ES.ToUint32(self.length);
  
              // If no callback function or if callback is not a callable function
              if (!isCallable(callbackfn)) {
                  throw new TypeError('Array.prototype.reduceRight callback must be a function');
              }
  
              // no value to return if no initial value, empty array
              if (length === 0 && arguments.length === 1) {
                  throw new TypeError('reduceRight of empty array with no initial value');
              }
  
              var result;
              var i = length - 1;
              if (arguments.length >= 2) {
                  result = arguments[1];
              } else {
                  do {
                      if (i in self) {
                          result = self[i--];
                          break;
                      }
  
                      // if array contains no values, no initial value to return
                      if (--i < 0) {
                          throw new TypeError('reduceRight of empty array with no initial value');
                      }
                  } while (true);
              }
  
              if (i < 0) {
                  return result;
              }
  
              do {
                  if (i in self) {
                      result = callbackfn(result, self[i], i, object);
                  }
              } while (i--);
  
              return result;
          }
      }, !reduceRightCoercesToObject);
  
      // ES5 15.4.4.14
      // http://es5.github.com/#x15.4.4.14
      // https://developer.mozilla.org/en/JavaScript/Reference/Global_Objects/Array/indexOf
      var hasFirefox2IndexOfBug = ArrayPrototype.indexOf && [0, 1].indexOf(1, 2) !== -1;
      defineProperties(ArrayPrototype, {
          indexOf: function indexOf(searchElement/*, fromIndex */) {
              var self = splitString && isString(this) ? strSplit(this, '') : ES.ToObject(this);
              var length = ES.ToUint32(self.length);
  
              if (length === 0) {
                  return -1;
              }
  
              var i = 0;
              if (arguments.length > 1) {
                  i = ES.ToInteger(arguments[1]);
              }
  
              // handle negative indices
              i = i >= 0 ? i : max(0, length + i);
              for (; i < length; i++) {
                  if (i in self && self[i] === searchElement) {
                      return i;
                  }
              }
              return -1;
          }
      }, hasFirefox2IndexOfBug);
  
      // ES5 15.4.4.15
      // http://es5.github.com/#x15.4.4.15
      // https://developer.mozilla.org/en/JavaScript/Reference/Global_Objects/Array/lastIndexOf
      var hasFirefox2LastIndexOfBug = ArrayPrototype.lastIndexOf && [0, 1].lastIndexOf(0, -3) !== -1;
      defineProperties(ArrayPrototype, {
          lastIndexOf: function lastIndexOf(searchElement/*, fromIndex */) {
              var self = splitString && isString(this) ? strSplit(this, '') : ES.ToObject(this);
              var length = ES.ToUint32(self.length);
  
              if (length === 0) {
                  return -1;
              }
              var i = length - 1;
              if (arguments.length > 1) {
                  i = min(i, ES.ToInteger(arguments[1]));
              }
              // handle negative indices
              i = i >= 0 ? i : length - Math.abs(i);
              for (; i >= 0; i--) {
                  if (i in self && searchElement === self[i]) {
                      return i;
                  }
              }
              return -1;
          }
      }, hasFirefox2LastIndexOfBug);
  
      // ES5 15.4.4.12
      // http://es5.github.com/#x15.4.4.12
      var spliceNoopReturnsEmptyArray = (function () {
          var a = [1, 2];
          var result = a.splice();
          return a.length === 2 && isArray(result) && result.length === 0;
      }());
      defineProperties(ArrayPrototype, {
          // Safari 5.0 bug where .splice() returns undefined
          splice: function splice(start, deleteCount) {
              if (arguments.length === 0) {
                  return [];
              } else {
                  return array_splice.apply(this, arguments);
              }
          }
      }, !spliceNoopReturnsEmptyArray);
  
      var spliceWorksWithEmptyObject = (function () {
          var obj = {};
          ArrayPrototype.splice.call(obj, 0, 0, 1);
          return obj.length === 1;
      }());
      defineProperties(ArrayPrototype, {
          splice: function splice(start, deleteCount) {
              if (arguments.length === 0) {
                  return [];
              }
              var args = arguments;
              this.length = max(ES.ToInteger(this.length), 0);
              if (arguments.length > 0 && typeof deleteCount !== 'number') {
                  args = arraySlice(arguments);
                  if (args.length < 2) {
                      pushCall(args, this.length - start);
                  } else {
                      args[1] = ES.ToInteger(deleteCount);
                  }
              }
              return array_splice.apply(this, args);
          }
      }, !spliceWorksWithEmptyObject);
      var spliceWorksWithLargeSparseArrays = (function () {
          // Per https://github.com/es-shims/es5-shim/issues/295
          // Safari 7/8 breaks with sparse arrays of size 1e5 or greater
          var arr = new $Array(1e5);
          // note: the index MUST be 8 or larger or the test will false pass
          arr[8] = 'x';
          arr.splice(1, 1);
          // note: this test must be defined *after* the indexOf shim
          // per https://github.com/es-shims/es5-shim/issues/313
          return arr.indexOf('x') === 7;
      }());
      var spliceWorksWithSmallSparseArrays = (function () {
          // Per https://github.com/es-shims/es5-shim/issues/295
          // Opera 12.15 breaks on this, no idea why.
          var n = 256;
          var arr = [];
          arr[n] = 'a';
          arr.splice(n + 1, 0, 'b');
          return arr[n] === 'a';
      }());
      defineProperties(ArrayPrototype, {
          splice: function splice(start, deleteCount) {
              var O = ES.ToObject(this);
              var A = [];
              var len = ES.ToUint32(O.length);
              var relativeStart = ES.ToInteger(start);
              var actualStart = relativeStart < 0 ? max((len + relativeStart), 0) : min(relativeStart, len);
              var actualDeleteCount = min(max(ES.ToInteger(deleteCount), 0), len - actualStart);
  
              var k = 0;
              var from;
              while (k < actualDeleteCount) {
                  from = $String(actualStart + k);
                  if (owns(O, from)) {
                      A[k] = O[from];
                  }
                  k += 1;
              }
  
              var items = arraySlice(arguments, 2);
              var itemCount = items.length;
              var to;
              if (itemCount < actualDeleteCount) {
                  k = actualStart;
                  var maxK = len - actualDeleteCount;
                  while (k < maxK) {
                      from = $String(k + actualDeleteCount);
                      to = $String(k + itemCount);
                      if (owns(O, from)) {
                          O[to] = O[from];
                      } else {
                          delete O[to];
                      }
                      k += 1;
                  }
                  k = len;
                  var minK = len - actualDeleteCount + itemCount;
                  while (k > minK) {
                      delete O[k - 1];
                      k -= 1;
                  }
              } else if (itemCount > actualDeleteCount) {
                  k = len - actualDeleteCount;
                  while (k > actualStart) {
                      from = $String(k + actualDeleteCount - 1);
                      to = $String(k + itemCount - 1);
                      if (owns(O, from)) {
                          O[to] = O[from];
                      } else {
                          delete O[to];
                      }
                      k -= 1;
                  }
              }
              k = actualStart;
              for (var i = 0; i < items.length; ++i) {
                  O[k] = items[i];
                  k += 1;
              }
              O.length = len - actualDeleteCount + itemCount;
  
              return A;
          }
      }, !spliceWorksWithLargeSparseArrays || !spliceWorksWithSmallSparseArrays);
  
      var originalJoin = ArrayPrototype.join;
      var hasStringJoinBug;
      try {
          hasStringJoinBug = Array.prototype.join.call('123', ',') !== '1,2,3';
      } catch (e) {
          hasStringJoinBug = true;
      }
      if (hasStringJoinBug) {
          defineProperties(ArrayPrototype, {
              join: function join(separator) {
                  var sep = typeof separator === 'undefined' ? ',' : separator;
                  return originalJoin.call(isString(this) ? strSplit(this, '') : this, sep);
              }
          }, hasStringJoinBug);
      }
  
      var hasJoinUndefinedBug = [1, 2].join(undefined) !== '1,2';
      if (hasJoinUndefinedBug) {
          defineProperties(ArrayPrototype, {
              join: function join(separator) {
                  var sep = typeof separator === 'undefined' ? ',' : separator;
                  return originalJoin.call(this, sep);
              }
          }, hasJoinUndefinedBug);
      }
  
      var pushShim = function push(item) {
          var O = ES.ToObject(this);
          var n = ES.ToUint32(O.length);
          var i = 0;
          while (i < arguments.length) {
              O[n + i] = arguments[i];
              i += 1;
          }
          O.length = n + i;
          return n + i;
      };
  
      var pushIsNotGeneric = (function () {
          var obj = {};
          var result = Array.prototype.push.call(obj, undefined);
          return result !== 1 || obj.length !== 1 || typeof obj[0] !== 'undefined' || !owns(obj, 0);
      }());
      defineProperties(ArrayPrototype, {
          push: function push(item) {
              if (isArray(this)) {
                  return array_push.apply(this, arguments);
              }
              return pushShim.apply(this, arguments);
          }
      }, pushIsNotGeneric);
  
      // This fixes a very weird bug in Opera 10.6 when pushing `undefined
      var pushUndefinedIsWeird = (function () {
          var arr = [];
          var result = arr.push(undefined);
          return result !== 1 || arr.length !== 1 || typeof arr[0] !== 'undefined' || !owns(arr, 0);
      }());
      defineProperties(ArrayPrototype, { push: pushShim }, pushUndefinedIsWeird);
  
      // ES5 15.2.3.14
      // http://es5.github.io/#x15.4.4.10
      // Fix boxed string bug
      defineProperties(ArrayPrototype, {
          slice: function (start, end) {
              var arr = isString(this) ? strSplit(this, '') : this;
              return arraySliceApply(arr, arguments);
          }
      }, splitString);
  
      var sortIgnoresNonFunctions = (function () {
          try {
              [1, 2].sort(null);
          } catch (e) {
              try {
                  [1, 2].sort({});
              } catch (e2) {
                  return false;
              }
          }
          return true;
      }());
      var sortThrowsOnRegex = (function () {
          // this is a problem in Firefox 4, in which `typeof /a/ === 'function'`
          try {
              [1, 2].sort(/a/);
              return false;
          } catch (e) {}
          return true;
      }());
      var sortIgnoresUndefined = (function () {
          // applies in IE 8, for one.
          try {
              [1, 2].sort(undefined);
              return true;
          } catch (e) {}
          return false;
      }());
      defineProperties(ArrayPrototype, {
          sort: function sort(compareFn) {
              if (typeof compareFn === 'undefined') {
                  return arraySort(this);
              }
              if (!isCallable(compareFn)) {
                  throw new TypeError('Array.prototype.sort callback must be a function');
              }
              return arraySort(this, compareFn);
          }
      }, sortIgnoresNonFunctions || !sortIgnoresUndefined || !sortThrowsOnRegex);
  
      //
      // Object
      // ======
      //
  
      // ES5 15.2.3.14
      // http://es5.github.com/#x15.2.3.14
  
      // http://whattheheadsaid.com/2010/10/a-safer-object-keys-compatibility-implementation
      var hasDontEnumBug = !isEnum({ 'toString': null }, 'toString'); // jscs:ignore disallowQuotedKeysInObjects
      var hasProtoEnumBug = isEnum(function () {}, 'prototype');
      var hasStringEnumBug = !owns('x', '0');
      var equalsConstructorPrototype = function (o) {
          var ctor = o.constructor;
          return ctor && ctor.prototype === o;
      };
      var excludedKeys = {
          $window: true,
          $console: true,
          $parent: true,
          $self: true,
          $frame: true,
          $frames: true,
          $frameElement: true,
          $webkitIndexedDB: true,
          $webkitStorageInfo: true,
          $external: true,
          $width: true,
          $height: true,
          $top: true,
          $localStorage: true
      };
      var hasAutomationEqualityBug = (function () {
          /* globals window */
          if (typeof window === 'undefined') {
              return false;
          }
          for (var k in window) {
              try {
                  if (!excludedKeys['$' + k] && owns(window, k) && window[k] !== null && typeof window[k] === 'object') {
                      equalsConstructorPrototype(window[k]);
                  }
              } catch (e) {
                  return true;
              }
          }
          return false;
      }());
      var equalsConstructorPrototypeIfNotBuggy = function (object) {
          if (typeof window === 'undefined' || !hasAutomationEqualityBug) {
              return equalsConstructorPrototype(object);
          }
          try {
              return equalsConstructorPrototype(object);
          } catch (e) {
              return false;
          }
      };
      var dontEnums = [
          'toString',
          'toLocaleString',
          'valueOf',
          'hasOwnProperty',
          'isPrototypeOf',
          'propertyIsEnumerable',
          'constructor'
      ];
      var dontEnumsLength = dontEnums.length;
  
      // taken directly from https://github.com/ljharb/is-arguments/blob/master/index.js
      // can be replaced with require('is-arguments') if we ever use a build process instead
      var isStandardArguments = function isArguments(value) {
          return toStr(value) === '[object Arguments]';
      };
      var isLegacyArguments = function isArguments(value) {
          return value !== null
              && typeof value === 'object'
              && typeof value.length === 'number'
              && value.length >= 0
              && !isArray(value)
              && isCallable(value.callee);
      };
      var isArguments = isStandardArguments(arguments) ? isStandardArguments : isLegacyArguments;
  
      defineProperties($Object, {
          keys: function keys(object) {
              var isFn = isCallable(object);
              var isArgs = isArguments(object);
              var isObject = object !== null && typeof object === 'object';
              var isStr = isObject && isString(object);
  
              if (!isObject && !isFn && !isArgs) {
                  throw new TypeError('Object.keys called on a non-object');
              }
  
              var theKeys = [];
              var skipProto = hasProtoEnumBug && isFn;
              if ((isStr && hasStringEnumBug) || isArgs) {
                  for (var i = 0; i < object.length; ++i) {
                      pushCall(theKeys, $String(i));
                  }
              }
  
              if (!isArgs) {
                  for (var name in object) {
                      if (!(skipProto && name === 'prototype') && owns(object, name)) {
                          pushCall(theKeys, $String(name));
                      }
                  }
              }
  
              if (hasDontEnumBug) {
                  var skipConstructor = equalsConstructorPrototypeIfNotBuggy(object);
                  for (var j = 0; j < dontEnumsLength; j++) {
                      var dontEnum = dontEnums[j];
                      if (!(skipConstructor && dontEnum === 'constructor') && owns(object, dontEnum)) {
                          pushCall(theKeys, dontEnum);
                      }
                  }
              }
              return theKeys;
          }
      });
  
      var keysWorksWithArguments = $Object.keys && (function () {
          // Safari 5.0 bug
          return $Object.keys(arguments).length === 2;
      }(1, 2));
      var keysHasArgumentsLengthBug = $Object.keys && (function () {
          var argKeys = $Object.keys(arguments);
          return arguments.length !== 1 || argKeys.length !== 1 || argKeys[0] !== 1;
      }(1));
      var originalKeys = $Object.keys;
      defineProperties($Object, {
          keys: function keys(object) {
              if (isArguments(object)) {
                  return originalKeys(arraySlice(object));
              } else {
                  return originalKeys(object);
              }
          }
      }, !keysWorksWithArguments || keysHasArgumentsLengthBug);
  
      //
      // Date
      // ====
      //
  
      var hasNegativeMonthYearBug = new Date(-3509827329600292).getUTCMonth() !== 0;
      var aNegativeTestDate = new Date(-1509842289600292);
      var aPositiveTestDate = new Date(1449662400000);
      var hasToUTCStringFormatBug = aNegativeTestDate.toUTCString() !== 'Mon, 01 Jan -45875 11:59:59 GMT';
      var hasToDateStringFormatBug;
      var hasToStringFormatBug;
      var timeZoneOffset = aNegativeTestDate.getTimezoneOffset();
      if (timeZoneOffset < -720) {
          hasToDateStringFormatBug = aNegativeTestDate.toDateString() !== 'Tue Jan 02 -45875';
          hasToStringFormatBug = !(/^Thu Dec 10 2015 \d\d:\d\d:\d\d GMT[-+]\d\d\d\d(?: |$)/).test(String(aPositiveTestDate));
      } else {
          hasToDateStringFormatBug = aNegativeTestDate.toDateString() !== 'Mon Jan 01 -45875';
          hasToStringFormatBug = !(/^Wed Dec 09 2015 \d\d:\d\d:\d\d GMT[-+]\d\d\d\d(?: |$)/).test(String(aPositiveTestDate));
      }
  
      var originalGetFullYear = call.bind(Date.prototype.getFullYear);
      var originalGetMonth = call.bind(Date.prototype.getMonth);
      var originalGetDate = call.bind(Date.prototype.getDate);
      var originalGetUTCFullYear = call.bind(Date.prototype.getUTCFullYear);
      var originalGetUTCMonth = call.bind(Date.prototype.getUTCMonth);
      var originalGetUTCDate = call.bind(Date.prototype.getUTCDate);
      var originalGetUTCDay = call.bind(Date.prototype.getUTCDay);
      var originalGetUTCHours = call.bind(Date.prototype.getUTCHours);
      var originalGetUTCMinutes = call.bind(Date.prototype.getUTCMinutes);
      var originalGetUTCSeconds = call.bind(Date.prototype.getUTCSeconds);
      var originalGetUTCMilliseconds = call.bind(Date.prototype.getUTCMilliseconds);
      var dayName = ['Sun', 'Mon', 'Tue', 'Wed', 'Thu', 'Fri', 'Sat'];
      var monthName = ['Jan', 'Feb', 'Mar', 'Apr', 'May', 'Jun', 'Jul', 'Aug', 'Sep', 'Oct', 'Nov', 'Dec'];
      var daysInMonth = function daysInMonth(month, year) {
          return originalGetDate(new Date(year, month, 0));
      };
  
      defineProperties(Date.prototype, {
          getFullYear: function getFullYear() {
              if (!this || !(this instanceof Date)) {
                  throw new TypeError('this is not a Date object.');
              }
              var year = originalGetFullYear(this);
              if (year < 0 && originalGetMonth(this) > 11) {
                  return year + 1;
              }
              return year;
          },
          getMonth: function getMonth() {
              if (!this || !(this instanceof Date)) {
                  throw new TypeError('this is not a Date object.');
              }
              var year = originalGetFullYear(this);
              var month = originalGetMonth(this);
              if (year < 0 && month > 11) {
                  return 0;
              }
              return month;
          },
          getDate: function getDate() {
              if (!this || !(this instanceof Date)) {
                  throw new TypeError('this is not a Date object.');
              }
              var year = originalGetFullYear(this);
              var month = originalGetMonth(this);
              var date = originalGetDate(this);
              if (year < 0 && month > 11) {
                  if (month === 12) {
                      return date;
                  }
                  var days = daysInMonth(0, year + 1);
                  return (days - date) + 1;
              }
              return date;
          },
          getUTCFullYear: function getUTCFullYear() {
              if (!this || !(this instanceof Date)) {
                  throw new TypeError('this is not a Date object.');
              }
              var year = originalGetUTCFullYear(this);
              if (year < 0 && originalGetUTCMonth(this) > 11) {
                  return year + 1;
              }
              return year;
          },
          getUTCMonth: function getUTCMonth() {
              if (!this || !(this instanceof Date)) {
                  throw new TypeError('this is not a Date object.');
              }
              var year = originalGetUTCFullYear(this);
              var month = originalGetUTCMonth(this);
              if (year < 0 && month > 11) {
                  return 0;
              }
              return month;
          },
          getUTCDate: function getUTCDate() {
              if (!this || !(this instanceof Date)) {
                  throw new TypeError('this is not a Date object.');
              }
              var year = originalGetUTCFullYear(this);
              var month = originalGetUTCMonth(this);
              var date = originalGetUTCDate(this);
              if (year < 0 && month > 11) {
                  if (month === 12) {
                      return date;
                  }
                  var days = daysInMonth(0, year + 1);
                  return (days - date) + 1;
              }
              return date;
          }
      }, hasNegativeMonthYearBug);
  
      defineProperties(Date.prototype, {
          toUTCString: function toUTCString() {
              if (!this || !(this instanceof Date)) {
                  throw new TypeError('this is not a Date object.');
              }
              var day = originalGetUTCDay(this);
              var date = originalGetUTCDate(this);
              var month = originalGetUTCMonth(this);
              var year = originalGetUTCFullYear(this);
              var hour = originalGetUTCHours(this);
              var minute = originalGetUTCMinutes(this);
              var second = originalGetUTCSeconds(this);
              return dayName[day] + ', '
                  + (date < 10 ? '0' + date : date) + ' '
                  + monthName[month] + ' '
                  + year + ' '
                  + (hour < 10 ? '0' + hour : hour) + ':'
                  + (minute < 10 ? '0' + minute : minute) + ':'
                  + (second < 10 ? '0' + second : second) + ' GMT';
          }
      }, hasNegativeMonthYearBug || hasToUTCStringFormatBug);
  
      // Opera 12 has `,`
      defineProperties(Date.prototype, {
          toDateString: function toDateString() {
              if (!this || !(this instanceof Date)) {
                  throw new TypeError('this is not a Date object.');
              }
              var day = this.getDay();
              var date = this.getDate();
              var month = this.getMonth();
              var year = this.getFullYear();
              return dayName[day] + ' '
                  + monthName[month] + ' '
                  + (date < 10 ? '0' + date : date) + ' '
                  + year;
          }
      }, hasNegativeMonthYearBug || hasToDateStringFormatBug);
  
      // can't use defineProperties here because of toString enumeration issue in IE <= 8
      if (hasNegativeMonthYearBug || hasToStringFormatBug) {
          Date.prototype.toString = function toString() {
              if (!this || !(this instanceof Date)) {
                  throw new TypeError('this is not a Date object.');
              }
              var day = this.getDay();
              var date = this.getDate();
              var month = this.getMonth();
              var year = this.getFullYear();
              var hour = this.getHours();
              var minute = this.getMinutes();
              var second = this.getSeconds();
              var timezoneOffset = this.getTimezoneOffset();
              var hoursOffset = Math.floor(Math.abs(timezoneOffset) / 60);
              var minutesOffset = Math.floor(Math.abs(timezoneOffset) % 60);
              return dayName[day] + ' '
                  + monthName[month] + ' '
                  + (date < 10 ? '0' + date : date) + ' '
                  + year + ' '
                  + (hour < 10 ? '0' + hour : hour) + ':'
                  + (minute < 10 ? '0' + minute : minute) + ':'
                  + (second < 10 ? '0' + second : second) + ' GMT'
                  + (timezoneOffset > 0 ? '-' : '+')
                  + (hoursOffset < 10 ? '0' + hoursOffset : hoursOffset)
                  + (minutesOffset < 10 ? '0' + minutesOffset : minutesOffset);
          };
          if (supportsDescriptors) {
              $Object.defineProperty(Date.prototype, 'toString', {
                  configurable: true,
                  enumerable: false,
                  writable: true
              });
          }
      }
  
      // ES5 15.9.5.43
      // http://es5.github.com/#x15.9.5.43
      // This function returns a String value represent the instance in time
      // represented by this Date object. The format of the String is the Date Time
      // string format defined in 15.9.1.15. All fields are present in the String.
      // The time zone is always UTC, denoted by the suffix Z. If the time value of
      // this object is not a finite Number a RangeError exception is thrown.
      var negativeDate = -62198755200000;
      var negativeYearString = '-000001';
      var hasNegativeDateBug = Date.prototype.toISOString && new Date(negativeDate).toISOString().indexOf(negativeYearString) === -1; // eslint-disable-line max-len
      var hasSafari51DateBug = Date.prototype.toISOString && new Date(-1).toISOString() !== '1969-12-31T23:59:59.999Z';
  
      var getTime = call.bind(Date.prototype.getTime);
  
      defineProperties(Date.prototype, {
          toISOString: function toISOString() {
              if (!isFinite(this) || !isFinite(getTime(this))) {
                  // Adope Photoshop requires the second check.
                  throw new RangeError('Date.prototype.toISOString called on non-finite value.');
              }
  
              var year = originalGetUTCFullYear(this);
  
              var month = originalGetUTCMonth(this);
              // see https://github.com/es-shims/es5-shim/issues/111
              year += Math.floor(month / 12);
              month = ((month % 12) + 12) % 12;
  
              // the date time string format is specified in 15.9.1.15.
              var result = [
                  month + 1,
                  originalGetUTCDate(this),
                  originalGetUTCHours(this),
                  originalGetUTCMinutes(this),
                  originalGetUTCSeconds(this)
              ];
              year = (
                  (year < 0 ? '-' : (year > 9999 ? '+' : ''))
                  + strSlice('00000' + Math.abs(year), (0 <= year && year <= 9999) ? -4 : -6)
              );
  
              for (var i = 0; i < result.length; ++i) {
                  // pad months, days, hours, minutes, and seconds to have two digits.
                  result[i] = strSlice('00' + result[i], -2);
              }
              // pad milliseconds to have three digits.
              return (
                  year + '-' + arraySlice(result, 0, 2).join('-')
                  + 'T' + arraySlice(result, 2).join(':') + '.'
                  + strSlice('000' + originalGetUTCMilliseconds(this), -3) + 'Z'
              );
          }
      }, hasNegativeDateBug || hasSafari51DateBug);
  
      // ES5 15.9.5.44
      // http://es5.github.com/#x15.9.5.44
      // This function provides a String representation of a Date object for use by
      // JSON.stringify (15.12.3).
      var dateToJSONIsSupported = (function () {
          try {
              return Date.prototype.toJSON
                  && new Date(NaN).toJSON() === null
                  && new Date(negativeDate).toJSON().indexOf(negativeYearString) !== -1
                  && Date.prototype.toJSON.call({ // generic
                      toISOString: function () { return true; }
                  });
          } catch (e) {
              return false;
          }
      }());
      if (!dateToJSONIsSupported) {
          Date.prototype.toJSON = function toJSON(key) {
              // When the toJSON method is called with argument key, the following
              // steps are taken:
  
              // 1.  Let O be the result of calling ToObject, giving it the this
              // value as its argument.
              // 2. Let tv be ES.ToPrimitive(O, hint Number).
              var O = $Object(this);
              var tv = ES.ToPrimitive(O);
              // 3. If tv is a Number and is not finite, return null.
              if (typeof tv === 'number' && !isFinite(tv)) {
                  return null;
              }
              // 4. Let toISO be the result of calling the [[Get]] internal method of
              // O with argument "toISOString".
              var toISO = O.toISOString;
              // 5. If IsCallable(toISO) is false, throw a TypeError exception.
              if (!isCallable(toISO)) {
                  throw new TypeError('toISOString property is not callable');
              }
              // 6. Return the result of calling the [[Call]] internal method of
              //  toISO with O as the this value and an empty argument list.
              return toISO.call(O);
  
              // NOTE 1 The argument is ignored.
  
              // NOTE 2 The toJSON function is intentionally generic; it does not
              // require that its this value be a Date object. Therefore, it can be
              // transferred to other kinds of objects for use as a method. However,
              // it does require that any such object have a toISOString method. An
              // object is free to use the argument key to filter its
              // stringification.
          };
      }
  
      // ES5 15.9.4.2
      // http://es5.github.com/#x15.9.4.2
      // based on work shared by Daniel Friesen (dantman)
      // http://gist.github.com/303249
      var supportsExtendedYears = Date.parse('+033658-09-27T01:46:40.000Z') === 1e15;
      var acceptsInvalidDates = !isNaN(Date.parse('2012-04-04T24:00:00.500Z')) || !isNaN(Date.parse('2012-11-31T23:59:59.000Z')) || !isNaN(Date.parse('2012-12-31T23:59:60.000Z'));
      var doesNotParseY2KNewYear = isNaN(Date.parse('2000-01-01T00:00:00.000Z'));
      if (doesNotParseY2KNewYear || acceptsInvalidDates || !supportsExtendedYears) {
          // XXX global assignment won't work in embeddings that use
          // an alternate object for the context.
          /* global Date: true */
          var maxSafeUnsigned32Bit = Math.pow(2, 31) - 1;
          var hasSafariSignedIntBug = isActualNaN(new Date(1970, 0, 1, 0, 0, 0, maxSafeUnsigned32Bit + 1).getTime());
          // eslint-disable-next-line no-implicit-globals, no-global-assign
          Date = (function (NativeDate) {
              // Date.length === 7
              var DateShim = function Date(Y, M, D, h, m, s, ms) {
                  var length = arguments.length;
                  var date;
                  if (this instanceof NativeDate) {
                      var seconds = s;
                      var millis = ms;
                      if (hasSafariSignedIntBug && length >= 7 && ms > maxSafeUnsigned32Bit) {
                          // work around a Safari 8/9 bug where it treats the seconds as signed
                          var msToShift = Math.floor(ms / maxSafeUnsigned32Bit) * maxSafeUnsigned32Bit;
                          var sToShift = Math.floor(msToShift / 1e3);
                          seconds += sToShift;
                          millis -= sToShift * 1e3;
                      }
                      date = length === 1 && $String(Y) === Y // isString(Y)
                          // We explicitly pass it through parse:
                          ? new NativeDate(DateShim.parse(Y))
                          // We have to manually make calls depending on argument
                          // length here
                          : length >= 7 ? new NativeDate(Y, M, D, h, m, seconds, millis)
                              : length >= 6 ? new NativeDate(Y, M, D, h, m, seconds)
                                  : length >= 5 ? new NativeDate(Y, M, D, h, m)
                                      : length >= 4 ? new NativeDate(Y, M, D, h)
                                          : length >= 3 ? new NativeDate(Y, M, D)
                                              : length >= 2 ? new NativeDate(Y, M)
                                                  : length >= 1 ? new NativeDate(Y instanceof NativeDate ? +Y : Y)
                                                      : new NativeDate();
                  } else {
                      date = NativeDate.apply(this, arguments);
                  }
                  if (!isPrimitive(date)) {
                      // Prevent mixups with unfixed Date object
                      defineProperties(date, { constructor: DateShim }, true);
                  }
                  return date;
              };
  
              // 15.9.1.15 Date Time String Format.
              var isoDateExpression = new RegExp('^'
                  + '(\\d{4}|[+-]\\d{6})' // four-digit year capture or sign + 6-digit extended year
                  + '(?:-(\\d{2})' // optional month capture
                  + '(?:-(\\d{2})' // optional day capture
                  + '(?:' // capture hours:minutes:seconds.milliseconds
                      + 'T(\\d{2})' // hours capture
                      + ':(\\d{2})' // minutes capture
                      + '(?:' // optional :seconds.milliseconds
                          + ':(\\d{2})' // seconds capture
                          + '(?:(\\.\\d{1,}))?' // milliseconds capture
                      + ')?'
                  + '(' // capture UTC offset component
                      + 'Z|' // UTC capture
                      + '(?:' // offset specifier +/-hours:minutes
                          + '([-+])' // sign capture
                          + '(\\d{2})' // hours offset capture
                          + ':(\\d{2})' // minutes offset capture
                      + ')'
                  + ')?)?)?)?'
              + '$');
  
              var months = [0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334, 365];
  
              var dayFromMonth = function dayFromMonth(year, month) {
                  var t = month > 1 ? 1 : 0;
                  return (
                      months[month]
                      + Math.floor((year - 1969 + t) / 4)
                      - Math.floor((year - 1901 + t) / 100)
                      + Math.floor((year - 1601 + t) / 400)
                      + (365 * (year - 1970))
                  );
              };
  
              var toUTC = function toUTC(t) {
                  var s = 0;
                  var ms = t;
                  if (hasSafariSignedIntBug && ms > maxSafeUnsigned32Bit) {
                      // work around a Safari 8/9 bug where it treats the seconds as signed
                      var msToShift = Math.floor(ms / maxSafeUnsigned32Bit) * maxSafeUnsigned32Bit;
                      var sToShift = Math.floor(msToShift / 1e3);
                      s += sToShift;
                      ms -= sToShift * 1e3;
                  }
                  return $Number(new NativeDate(1970, 0, 1, 0, 0, s, ms));
              };
  
              // Copy any custom methods a 3rd party library may have added
              for (var key in NativeDate) {
                  if (owns(NativeDate, key)) {
                      DateShim[key] = NativeDate[key];
                  }
              }
  
              // Copy "native" methods explicitly; they may be non-enumerable
              defineProperties(DateShim, {
                  now: NativeDate.now,
                  UTC: NativeDate.UTC
              }, true);
              DateShim.prototype = NativeDate.prototype;
              defineProperties(DateShim.prototype, { constructor: DateShim }, true);
  
              // Upgrade Date.parse to handle simplified ISO 8601 strings
              var parseShim = function parse(string) {
                  var match = isoDateExpression.exec(string);
                  if (match) {
                      // parse months, days, hours, minutes, seconds, and milliseconds
                      // provide default values if necessary
                      // parse the UTC offset component
                      var year = $Number(match[1]),
                          month = $Number(match[2] || 1) - 1,
                          day = $Number(match[3] || 1) - 1,
                          hour = $Number(match[4] || 0),
                          minute = $Number(match[5] || 0),
                          second = $Number(match[6] || 0),
                          millisecond = Math.floor($Number(match[7] || 0) * 1000),
                          // When time zone is missed, local offset should be used
                          // (ES 5.1 bug)
                          // see https://bugs.ecmascript.org/show_bug.cgi?id=112
                          isLocalTime = Boolean(match[4] && !match[8]),
                          signOffset = match[9] === '-' ? 1 : -1,
                          hourOffset = $Number(match[10] || 0),
                          minuteOffset = $Number(match[11] || 0),
                          result;
                      var hasMinutesOrSecondsOrMilliseconds = minute > 0 || second > 0 || millisecond > 0;
                      if (
                          hour < (hasMinutesOrSecondsOrMilliseconds ? 24 : 25)
                          && minute < 60 && second < 60 && millisecond < 1000
                          && month > -1 && month < 12 && hourOffset < 24
                          && minuteOffset < 60 // detect invalid offsets
                          && day > -1
                          && day < (dayFromMonth(year, month + 1) - dayFromMonth(year, month))
                      ) {
                          result = (
                              ((dayFromMonth(year, month) + day) * 24)
                              + hour
                              + (hourOffset * signOffset)
                          ) * 60;
                          result = ((
                              ((result + minute + (minuteOffset * signOffset)) * 60)
                              + second
                          ) * 1000) + millisecond;
                          if (isLocalTime) {
                              result = toUTC(result);
                          }
                          if (-8.64e15 <= result && result <= 8.64e15) {
                              return result;
                          }
                      }
                      return NaN;
                  }
                  return NativeDate.parse.apply(this, arguments);
              };
              defineProperties(DateShim, { parse: parseShim });
  
              return DateShim;
          }(Date));
          /* global Date: false */
      }
  
      // ES5 15.9.4.4
      // http://es5.github.com/#x15.9.4.4
      if (!Date.now) {
          Date.now = function now() {
              return new Date().getTime();
          };
      }
  
      //
      // Number
      // ======
      //
  
      // ES5.1 15.7.4.5
      // http://es5.github.com/#x15.7.4.5
      var hasToFixedBugs = NumberPrototype.toFixed && (
          (0.00008).toFixed(3) !== '0.000'
          || (0.9).toFixed(0) !== '1'
          || (1.255).toFixed(2) !== '1.25'
          || (1000000000000000128).toFixed(0) !== '1000000000000000128'
      );
  
      var toFixedHelpers = {
          base: 1e7,
          size: 6,
          data: [0, 0, 0, 0, 0, 0],
          multiply: function multiply(n, c) {
              var i = -1;
              var c2 = c;
              while (++i < toFixedHelpers.size) {
                  c2 += n * toFixedHelpers.data[i];
                  toFixedHelpers.data[i] = c2 % toFixedHelpers.base;
                  c2 = Math.floor(c2 / toFixedHelpers.base);
              }
          },
          divide: function divide(n) {
              var i = toFixedHelpers.size;
              var c = 0;
              while (--i >= 0) {
                  c += toFixedHelpers.data[i];
                  toFixedHelpers.data[i] = Math.floor(c / n);
                  c = (c % n) * toFixedHelpers.base;
              }
          },
          numToString: function numToString() {
              var i = toFixedHelpers.size;
              var s = '';
              while (--i >= 0) {
                  if (s !== '' || i === 0 || toFixedHelpers.data[i] !== 0) {
                      var t = $String(toFixedHelpers.data[i]);
                      if (s === '') {
                          s = t;
                      } else {
                          s += strSlice('0000000', 0, 7 - t.length) + t;
                      }
                  }
              }
              return s;
          },
          pow: function pow(x, n, acc) {
              return (n === 0 ? acc : (n % 2 === 1 ? pow(x, n - 1, acc * x) : pow(x * x, n / 2, acc)));
          },
          log: function log(x) {
              var n = 0;
              var x2 = x;
              while (x2 >= 4096) {
                  n += 12;
                  x2 /= 4096;
              }
              while (x2 >= 2) {
                  n += 1;
                  x2 /= 2;
              }
              return n;
          }
      };
  
      var toFixedShim = function toFixed(fractionDigits) {
          var f, x, s, m, e, z, j, k;
  
          // Test for NaN and round fractionDigits down
          f = $Number(fractionDigits);
          f = isActualNaN(f) ? 0 : Math.floor(f);
  
          if (f < 0 || f > 20) {
              throw new RangeError('Number.toFixed called with invalid number of decimals');
          }
  
          x = $Number(this);
  
          if (isActualNaN(x)) {
              return 'NaN';
          }
  
          // If it is too big or small, return the string value of the number
          if (x <= -1e21 || x >= 1e21) {
              return $String(x);
          }
  
          s = '';
  
          if (x < 0) {
              s = '-';
              x = -x;
          }
  
          m = '0';
  
          if (x > 1e-21) {
              // 1e-21 < x < 1e21
              // -70 < log2(x) < 70
              e = toFixedHelpers.log(x * toFixedHelpers.pow(2, 69, 1)) - 69;
              z = (e < 0 ? x * toFixedHelpers.pow(2, -e, 1) : x / toFixedHelpers.pow(2, e, 1));
              z *= 0x10000000000000; // Math.pow(2, 52);
              e = 52 - e;
  
              // -18 < e < 122
              // x = z / 2 ^ e
              if (e > 0) {
                  toFixedHelpers.multiply(0, z);
                  j = f;
  
                  while (j >= 7) {
                      toFixedHelpers.multiply(1e7, 0);
                      j -= 7;
                  }
  
                  toFixedHelpers.multiply(toFixedHelpers.pow(10, j, 1), 0);
                  j = e - 1;
  
                  while (j >= 23) {
                      toFixedHelpers.divide(1 << 23);
                      j -= 23;
                  }
  
                  toFixedHelpers.divide(1 << j);
                  toFixedHelpers.multiply(1, 1);
                  toFixedHelpers.divide(2);
                  m = toFixedHelpers.numToString();
              } else {
                  toFixedHelpers.multiply(0, z);
                  toFixedHelpers.multiply(1 << (-e), 0);
                  m = toFixedHelpers.numToString() + strSlice('0.00000000000000000000', 2, 2 + f);
              }
          }
  
          if (f > 0) {
              k = m.length;
  
              if (k <= f) {
                  m = s + strSlice('0.0000000000000000000', 0, f - k + 2) + m;
              } else {
                  m = s + strSlice(m, 0, k - f) + '.' + strSlice(m, k - f);
              }
          } else {
              m = s + m;
          }
  
          return m;
      };
      defineProperties(NumberPrototype, { toFixed: toFixedShim }, hasToFixedBugs);
  
      var hasToPrecisionUndefinedBug = (function () {
          try {
              return 1.0.toPrecision(undefined) === '1';
          } catch (e) {
              return true;
          }
      }());
      var originalToPrecision = NumberPrototype.toPrecision;
      defineProperties(NumberPrototype, {
          toPrecision: function toPrecision(precision) {
              return typeof precision === 'undefined' ? originalToPrecision.call(this) : originalToPrecision.call(this, precision);
          }
      }, hasToPrecisionUndefinedBug);
  
      //
      // String
      // ======
      //
  
      // ES5 15.5.4.14
      // http://es5.github.com/#x15.5.4.14
  
      // [bugfix, IE lt 9, firefox 4, Konqueror, Opera, obscure browsers]
      // Many browsers do not split properly with regular expressions or they
      // do not perform the split correctly under obscure conditions.
      // See http://blog.stevenlevithan.com/archives/cross-browser-split
      // I've tested in many browsers and this seems to cover the deviant ones:
      //    'ab'.split(/(?:ab)*/) should be ["", ""], not [""]
      //    '.'.split(/(.?)(.?)/) should be ["", ".", "", ""], not ["", ""]
      //    'tesst'.split(/(s)*/) should be ["t", undefined, "e", "s", "t"], not
      //       [undefined, "t", undefined, "e", ...]
      //    ''.split(/.?/) should be [], not [""]
      //    '.'.split(/()()/) should be ["."], not ["", "", "."]
  
      if (
          'ab'.split(/(?:ab)*/).length !== 2
          || '.'.split(/(.?)(.?)/).length !== 4
          || 'tesst'.split(/(s)*/)[1] === 't'
          || 'test'.split(/(?:)/, -1).length !== 4
          || ''.split(/.?/).length
          || '.'.split(/()()/).length > 1
      ) {
          (function () {
              var compliantExecNpcg = typeof (/()??/).exec('')[1] === 'undefined'; // NPCG: nonparticipating capturing group
              var maxSafe32BitInt = Math.pow(2, 32) - 1;
  
              StringPrototype.split = function (separator, limit) {
                  var string = String(this);
                  if (typeof separator === 'undefined' && limit === 0) {
                      return [];
                  }
  
                  // If `separator` is not a regex, use native split
                  if (!isRegex(separator)) {
                      return strSplit(this, separator, limit);
                  }
  
                  var output = [];
                  var flags = (separator.ignoreCase ? 'i' : '')
                              + (separator.multiline ? 'm' : '')
                              + (separator.unicode ? 'u' : '') // in ES6
                              + (separator.sticky ? 'y' : ''), // Firefox 3+ and ES6
                      lastLastIndex = 0,
                      // Make `global` and avoid `lastIndex` issues by working with a copy
                      separator2, match, lastIndex, lastLength;
                  var separatorCopy = new RegExp(separator.source, flags + 'g');
                  if (!compliantExecNpcg) {
                      // Doesn't need flags gy, but they don't hurt
                      separator2 = new RegExp('^' + separatorCopy.source + '$(?!\\s)', flags);
                  }
                  /* Values for `limit`, per the spec:
                   * If undefined: 4294967295 // maxSafe32BitInt
                   * If 0, Infinity, or NaN: 0
                   * If positive number: limit = Math.floor(limit); if (limit > 4294967295) limit -= 4294967296;
                   * If negative number: 4294967296 - Math.floor(Math.abs(limit))
                   * If other: Type-convert, then use the above rules
                   */
                  var splitLimit = typeof limit === 'undefined' ? maxSafe32BitInt : ES.ToUint32(limit);
                  match = separatorCopy.exec(string);
                  while (match) {
                      // `separatorCopy.lastIndex` is not reliable cross-browser
                      lastIndex = match.index + match[0].length;
                      if (lastIndex > lastLastIndex) {
                          pushCall(output, strSlice(string, lastLastIndex, match.index));
                          // Fix browsers whose `exec` methods don't consistently return `undefined` for
                          // nonparticipating capturing groups
                          if (!compliantExecNpcg && match.length > 1) {
                              /* eslint-disable no-loop-func */
                              match[0].replace(separator2, function () {
                                  for (var i = 1; i < arguments.length - 2; i++) {
                                      if (typeof arguments[i] === 'undefined') {
                                          match[i] = void 0;
                                      }
                                  }
                              });
                              /* eslint-enable no-loop-func */
                          }
                          if (match.length > 1 && match.index < string.length) {
                              array_push.apply(output, arraySlice(match, 1));
                          }
                          lastLength = match[0].length;
                          lastLastIndex = lastIndex;
                          if (output.length >= splitLimit) {
                              break;
                          }
                      }
                      if (separatorCopy.lastIndex === match.index) {
                          separatorCopy.lastIndex++; // Avoid an infinite loop
                      }
                      match = separatorCopy.exec(string);
                  }
                  if (lastLastIndex === string.length) {
                      if (lastLength || !separatorCopy.test('')) {
                          pushCall(output, '');
                      }
                  } else {
                      pushCall(output, strSlice(string, lastLastIndex));
                  }
                  return output.length > splitLimit ? arraySlice(output, 0, splitLimit) : output;
              };
          }());
  
      // [bugfix, chrome]
      // If separator is undefined, then the result array contains just one String,
      // which is the this value (converted to a String). If limit is not undefined,
      // then the output array is truncated so that it contains no more than limit
      // elements.
      // "0".split(undefined, 0) -> []
      } else if ('0'.split(void 0, 0).length) {
          StringPrototype.split = function split(separator, limit) {
              if (typeof separator === 'undefined' && limit === 0) {
                  return [];
              }
              return strSplit(this, separator, limit);
          };
      }
  
      var str_replace = StringPrototype.replace;
      var replaceReportsGroupsCorrectly = (function () {
          var groups = [];
          'x'.replace(/x(.)?/g, function (match, group) {
              pushCall(groups, group);
          });
          return groups.length === 1 && typeof groups[0] === 'undefined';
      }());
  
      if (!replaceReportsGroupsCorrectly) {
          StringPrototype.replace = function replace(searchValue, replaceValue) {
              var isFn = isCallable(replaceValue);
              var hasCapturingGroups = isRegex(searchValue) && (/\)[*?]/).test(searchValue.source);
              if (!isFn || !hasCapturingGroups) {
                  return str_replace.call(this, searchValue, replaceValue);
              } else {
                  var wrappedReplaceValue = function (match) {
                      var length = arguments.length;
                      var originalLastIndex = searchValue.lastIndex;
                      searchValue.lastIndex = 0;
                      var args = searchValue.exec(match) || [];
                      searchValue.lastIndex = originalLastIndex;
                      pushCall(args, arguments[length - 2], arguments[length - 1]);
                      return replaceValue.apply(this, args);
                  };
                  return str_replace.call(this, searchValue, wrappedReplaceValue);
              }
          };
      }
  
      // ECMA-262, 3rd B.2.3
      // Not an ECMAScript standard, although ECMAScript 3rd Edition has a
      // non-normative section suggesting uniform semantics and it should be
      // normalized across all browsers
      // [bugfix, IE lt 9] IE < 9 substr() with negative value not working in IE
      var string_substr = StringPrototype.substr;
      var hasNegativeSubstrBug = ''.substr && '0b'.substr(-1) !== 'b';
      defineProperties(StringPrototype, {
          substr: function substr(start, length) {
              var normalizedStart = start;
              if (start < 0) {
                  normalizedStart = max(this.length + start, 0);
              }
              return string_substr.call(this, normalizedStart, length);
          }
      }, hasNegativeSubstrBug);
  
      // ES5 15.5.4.20
      // whitespace from: http://es5.github.io/#x15.5.4.20
      var ws = '\x09\x0A\x0B\x0C\x0D\x20\xA0\u1680\u180E\u2000\u2001\u2002\u2003'
          + '\u2004\u2005\u2006\u2007\u2008\u2009\u200A\u202F\u205F\u3000\u2028'
          + '\u2029\uFEFF';
      var zeroWidth = '\u200b';
      var wsRegexChars = '[' + ws + ']';
      var trimBeginRegexp = new RegExp('^' + wsRegexChars + wsRegexChars + '*');
      var trimEndRegexp = new RegExp(wsRegexChars + wsRegexChars + '*$');
      var hasTrimWhitespaceBug = StringPrototype.trim && (ws.trim() || !zeroWidth.trim());
      defineProperties(StringPrototype, {
          // http://blog.stevenlevithan.com/archives/faster-trim-javascript
          // http://perfectionkills.com/whitespace-deviations/
          trim: function trim() {
              if (typeof this === 'undefined' || this === null) {
                  throw new TypeError("can't convert " + this + ' to object');
              }
              return $String(this).replace(trimBeginRegexp, '').replace(trimEndRegexp, '');
          }
      }, hasTrimWhitespaceBug);
      var trim = call.bind(String.prototype.trim);
  
      var hasLastIndexBug = StringPrototype.lastIndexOf && 'abcあい'.lastIndexOf('あい', 2) !== -1;
      defineProperties(StringPrototype, {
          lastIndexOf: function lastIndexOf(searchString) {
              if (typeof this === 'undefined' || this === null) {
                  throw new TypeError("can't convert " + this + ' to object');
              }
              var S = $String(this);
              var searchStr = $String(searchString);
              var numPos = arguments.length > 1 ? $Number(arguments[1]) : NaN;
              var pos = isActualNaN(numPos) ? Infinity : ES.ToInteger(numPos);
              var start = min(max(pos, 0), S.length);
              var searchLen = searchStr.length;
              var k = start + searchLen;
              while (k > 0) {
                  k = max(0, k - searchLen);
                  var index = strIndexOf(strSlice(S, k, start + searchLen), searchStr);
                  if (index !== -1) {
                      return k + index;
                  }
              }
              return -1;
          }
      }, hasLastIndexBug);
  
      var originalLastIndexOf = StringPrototype.lastIndexOf;
      defineProperties(StringPrototype, {
          lastIndexOf: function lastIndexOf(searchString) {
              return originalLastIndexOf.apply(this, arguments);
          }
      }, StringPrototype.lastIndexOf.length !== 1);
  
      // ES-5 15.1.2.2
      // eslint-disable-next-line radix
      if (parseInt(ws + '08') !== 8 || parseInt(ws + '0x16') !== 22) {
          /* global parseInt: true */
          parseInt = (function (origParseInt) {
              var hexRegex = /^[-+]?0[xX]/;
              return function parseInt(str, radix) {
                  if (typeof str === 'symbol') {
                      // handle Symbols in node 8.3/8.4
                      // eslint-disable-next-line no-implicit-coercion, no-unused-expressions
                      '' + str; // jscs:ignore disallowImplicitTypeConversion
                  }
  
                  var string = trim(String(str));
                  var defaultedRadix = $Number(radix) || (hexRegex.test(string) ? 16 : 10);
                  return origParseInt(string, defaultedRadix);
              };
          }(parseInt));
      }
  
      // https://es5.github.io/#x15.1.2.3
      if (1 / parseFloat('-0') !== -Infinity) {
          /* global parseFloat: true */
          parseFloat = (function (origParseFloat) {
              return function parseFloat(string) {
                  var inputString = trim(String(string));
                  var result = origParseFloat(inputString);
                  return result === 0 && strSlice(inputString, 0, 1) === '-' ? -0 : result;
              };
          }(parseFloat));
      }
  
      if (String(new RangeError('test')) !== 'RangeError: test') {
          var errorToStringShim = function toString() {
              if (typeof this === 'undefined' || this === null) {
                  throw new TypeError("can't convert " + this + ' to object');
              }
              var name = this.name;
              if (typeof name === 'undefined') {
                  name = 'Error';
              } else if (typeof name !== 'string') {
                  name = $String(name);
              }
              var msg = this.message;
              if (typeof msg === 'undefined') {
                  msg = '';
              } else if (typeof msg !== 'string') {
                  msg = $String(msg);
              }
              if (!name) {
                  return msg;
              }
              if (!msg) {
                  return name;
              }
              return name + ': ' + msg;
          };
          // can't use defineProperties here because of toString enumeration issue in IE <= 8
          Error.prototype.toString = errorToStringShim;
      }
  
      if (supportsDescriptors) {
          var ensureNonEnumerable = function (obj, prop) {
              if (isEnum(obj, prop)) {
                  var desc = Object.getOwnPropertyDescriptor(obj, prop);
                  if (desc.configurable) {
                      desc.enumerable = false;
                      Object.defineProperty(obj, prop, desc);
                  }
              }
          };
          ensureNonEnumerable(Error.prototype, 'message');
          if (Error.prototype.message !== '') {
              Error.prototype.message = '';
          }
          ensureNonEnumerable(Error.prototype, 'name');
      }
  
      if (String(/a/mig) !== '/a/gim') {
          var regexToString = function toString() {
              var str = '/' + this.source + '/';
              if (this.global) {
                  str += 'g';
              }
              if (this.ignoreCase) {
                  str += 'i';
              }
              if (this.multiline) {
                  str += 'm';
              }
              return str;
          };
          // can't use defineProperties here because of toString enumeration issue in IE <= 8
          RegExp.prototype.toString = regexToString;
      }
  }));
  
  /*! JSON v3.3.2 | http://bestiejs.github.io/json3 | Copyright 2012-2014, Kit Cambridge | http://kit.mit-license.org */
  ;(function () {
    // Detect the `define` function exposed by asynchronous module loaders. The
    // strict `define` check is necessary for compatibility with `r.js`.
    var isLoader = typeof define === "function" && define.amd;
  
    // A set of types used to distinguish objects from primitives.
    var objectTypes = {
      "function": true,
      "object": true
    };
  
    // Detect the `exports` object exposed by CommonJS implementations.
    var freeExports = objectTypes[typeof exports] && exports && !exports.nodeType && exports;
  
    // Use the `global` object exposed by Node (including Browserify via
    // `insert-module-globals`), Narwhal, and Ringo as the default context,
    // and the `window` object in browsers. Rhino exports a `global` function
    // instead.
    var root = objectTypes[typeof window] && window || this,
        freeGlobal = freeExports && objectTypes[typeof module] && module && !module.nodeType && typeof global == "object" && global;
  
    if (freeGlobal && (freeGlobal["global"] === freeGlobal || freeGlobal["window"] === freeGlobal || freeGlobal["self"] === freeGlobal)) {
      root = freeGlobal;
    }
  
    // Public: Initializes JSON 3 using the given `context` object, attaching the
    // `stringify` and `parse` functions to the specified `exports` object.
    function runInContext(context, exports) {
      context || (context = root["Object"]());
      exports || (exports = root["Object"]());
  
      // Native constructor aliases.
      var Number = context["Number"] || root["Number"],
          String = context["String"] || root["String"],
          Object = context["Object"] || root["Object"],
          Date = context["Date"] || root["Date"],
          SyntaxError = context["SyntaxError"] || root["SyntaxError"],
          TypeError = context["TypeError"] || root["TypeError"],
          Math = context["Math"] || root["Math"],
          nativeJSON = context["JSON"] || root["JSON"];
  
      // Delegate to the native `stringify` and `parse` implementations.
      if (typeof nativeJSON == "object" && nativeJSON) {
        exports.stringify = nativeJSON.stringify;
        exports.parse = nativeJSON.parse;
      }
  
      // Convenience aliases.
      var objectProto = Object.prototype,
          getClass = objectProto.toString,
          isProperty, forEach, undef;
  
      // Test the `Date#getUTC*` methods. Based on work by @Yaffle.
      var isExtended = new Date(-3509827334573292);
      try {
        // The `getUTCFullYear`, `Month`, and `Date` methods return nonsensical
        // results for certain dates in Opera >= 10.53.
        isExtended = isExtended.getUTCFullYear() == -109252 && isExtended.getUTCMonth() === 0 && isExtended.getUTCDate() === 1 &&
          // Safari < 2.0.2 stores the internal millisecond time value correctly,
          // but clips the values returned by the date methods to the range of
          // signed 32-bit integers ([-2 ** 31, 2 ** 31 - 1]).
          isExtended.getUTCHours() == 10 && isExtended.getUTCMinutes() == 37 && isExtended.getUTCSeconds() == 6 && isExtended.getUTCMilliseconds() == 708;
      } catch (exception) {}
  
      // Internal: Determines whether the native `JSON.stringify` and `parse`
      // implementations are spec-compliant. Based on work by Ken Snyder.
      function has(name) {
        if (has[name] !== undef) {
          // Return cached feature test result.
          return has[name];
        }
        var isSupported;
        if (name == "bug-string-char-index") {
          // IE <= 7 doesn't support accessing string characters using square
          // bracket notation. IE 8 only supports this for primitives.
          isSupported = "a"[0] != "a";
        } else if (name == "json") {
          // Indicates whether both `JSON.stringify` and `JSON.parse` are
          // supported.
          isSupported = has("json-stringify") && has("json-parse");
        } else {
          var value, serialized = '{"a":[1,true,false,null,"\\u0000\\b\\n\\f\\r\\t"]}';
          // Test `JSON.stringify`.
          if (name == "json-stringify") {
            var stringify = exports.stringify, stringifySupported = typeof stringify == "function" && isExtended;
            if (stringifySupported) {
              // A test function object with a custom `toJSON` method.
              (value = function () {
                return 1;
              }).toJSON = value;
              try {
                stringifySupported =
                  // Firefox 3.1b1 and b2 serialize string, number, and boolean
                  // primitives as object literals.
                  stringify(0) === "0" &&
                  // FF 3.1b1, b2, and JSON 2 serialize wrapped primitives as object
                  // literals.
                  stringify(new Number()) === "0" &&
                  stringify(new String()) == '""' &&
                  // FF 3.1b1, 2 throw an error if the value is `null`, `undefined`, or
                  // does not define a canonical JSON representation (this applies to
                  // objects with `toJSON` properties as well, *unless* they are nested
                  // within an object or array).
                  stringify(getClass) === undef &&
                  // IE 8 serializes `undefined` as `"undefined"`. Safari <= 5.1.7 and
                  // FF 3.1b3 pass this test.
                  stringify(undef) === undef &&
                  // Safari <= 5.1.7 and FF 3.1b3 throw `Error`s and `TypeError`s,
                  // respectively, if the value is omitted entirely.
                  stringify() === undef &&
                  // FF 3.1b1, 2 throw an error if the given value is not a number,
                  // string, array, object, Boolean, or `null` literal. This applies to
                  // objects with custom `toJSON` methods as well, unless they are nested
                  // inside object or array literals. YUI 3.0.0b1 ignores custom `toJSON`
                  // methods entirely.
                  stringify(value) === "1" &&
                  stringify([value]) == "[1]" &&
                  // Prototype <= 1.6.1 serializes `[undefined]` as `"[]"` instead of
                  // `"[null]"`.
                  stringify([undef]) == "[null]" &&
                  // YUI 3.0.0b1 fails to serialize `null` literals.
                  stringify(null) == "null" &&
                  // FF 3.1b1, 2 halts serialization if an array contains a function:
                  // `[1, true, getClass, 1]` serializes as "[1,true,],". FF 3.1b3
                  // elides non-JSON values from objects and arrays, unless they
                  // define custom `toJSON` methods.
                  stringify([undef, getClass, null]) == "[null,null,null]" &&
                  // Simple serialization test. FF 3.1b1 uses Unicode escape sequences
                  // where character escape codes are expected (e.g., `\b` => `\u0008`).
                  stringify({ "a": [value, true, false, null, "\x00\b\n\f\r\t"] }) == serialized &&
                  // FF 3.1b1 and b2 ignore the `filter` and `width` arguments.
                  stringify(null, value) === "1" &&
                  stringify([1, 2], null, 1) == "[\n 1,\n 2\n]" &&
                  // JSON 2, Prototype <= 1.7, and older WebKit builds incorrectly
                  // serialize extended years.
                  stringify(new Date(-8.64e15)) == '"-271821-04-20T00:00:00.000Z"' &&
                  // The milliseconds are optional in ES 5, but required in 5.1.
                  stringify(new Date(8.64e15)) == '"+275760-09-13T00:00:00.000Z"' &&
                  // Firefox <= 11.0 incorrectly serializes years prior to 0 as negative
                  // four-digit years instead of six-digit years. Credits: @Yaffle.
                  stringify(new Date(-621987552e5)) == '"-000001-01-01T00:00:00.000Z"' &&
                  // Safari <= 5.1.5 and Opera >= 10.53 incorrectly serialize millisecond
                  // values less than 1000. Credits: @Yaffle.
                  stringify(new Date(-1)) == '"1969-12-31T23:59:59.999Z"';
              } catch (exception) {
                stringifySupported = false;
              }
            }
            isSupported = stringifySupported;
          }
          // Test `JSON.parse`.
          if (name == "json-parse") {
            var parse = exports.parse;
            if (typeof parse == "function") {
              try {
                // FF 3.1b1, b2 will throw an exception if a bare literal is provided.
                // Conforming implementations should also coerce the initial argument to
                // a string prior to parsing.
                if (parse("0") === 0 && !parse(false)) {
                  // Simple parsing test.
                  value = parse(serialized);
                  var parseSupported = value["a"].length == 5 && value["a"][0] === 1;
                  if (parseSupported) {
                    try {
                      // Safari <= 5.1.2 and FF 3.1b1 allow unescaped tabs in strings.
                      parseSupported = !parse('"\t"');
                    } catch (exception) {}
                    if (parseSupported) {
                      try {
                        // FF 4.0 and 4.0.1 allow leading `+` signs and leading
                        // decimal points. FF 4.0, 4.0.1, and IE 9-10 also allow
                        // certain octal literals.
                        parseSupported = parse("01") !== 1;
                      } catch (exception) {}
                    }
                    if (parseSupported) {
                      try {
                        // FF 4.0, 4.0.1, and Rhino 1.7R3-R4 allow trailing decimal
                        // points. These environments, along with FF 3.1b1 and 2,
                        // also allow trailing commas in JSON objects and arrays.
                        parseSupported = parse("1.") !== 1;
                      } catch (exception) {}
                    }
                  }
                }
              } catch (exception) {
                parseSupported = false;
              }
            }
            isSupported = parseSupported;
          }
        }
        return has[name] = !!isSupported;
      }
  
      if (!has("json")) {
        // Common `[[Class]]` name aliases.
        var functionClass = "[object Function]",
            dateClass = "[object Date]",
            numberClass = "[object Number]",
            stringClass = "[object String]",
            arrayClass = "[object Array]",
            booleanClass = "[object Boolean]";
  
        // Detect incomplete support for accessing string characters by index.
        var charIndexBuggy = has("bug-string-char-index");
  
        // Define additional utility methods if the `Date` methods are buggy.
        if (!isExtended) {
          var floor = Math.floor;
          // A mapping between the months of the year and the number of days between
          // January 1st and the first of the respective month.
          var Months = [0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334];
          // Internal: Calculates the number of days between the Unix epoch and the
          // first day of the given month.
          var getDay = function (year, month) {
            return Months[month] + 365 * (year - 1970) + floor((year - 1969 + (month = +(month > 1))) / 4) - floor((year - 1901 + month) / 100) + floor((year - 1601 + month) / 400);
          };
        }
  
        // Internal: Determines if a property is a direct property of the given
        // object. Delegates to the native `Object#hasOwnProperty` method.
        if (!(isProperty = objectProto.hasOwnProperty)) {
          isProperty = function (property) {
            var members = {}, constructor;
            if ((members.__proto__ = null, members.__proto__ = {
              // The *proto* property cannot be set multiple times in recent
              // versions of Firefox and SeaMonkey.
              "toString": 1
            }, members).toString != getClass) {
              // Safari <= 2.0.3 doesn't implement `Object#hasOwnProperty`, but
              // supports the mutable *proto* property.
              isProperty = function (property) {
                // Capture and break the object's prototype chain (see section 8.6.2
                // of the ES 5.1 spec). The parenthesized expression prevents an
                // unsafe transformation by the Closure Compiler.
                var original = this.__proto__, result = property in (this.__proto__ = null, this);
                // Restore the original prototype chain.
                this.__proto__ = original;
                return result;
              };
            } else {
              // Capture a reference to the top-level `Object` constructor.
              constructor = members.constructor;
              // Use the `constructor` property to simulate `Object#hasOwnProperty` in
              // other environments.
              isProperty = function (property) {
                var parent = (this.constructor || constructor).prototype;
                return property in this && !(property in parent && this[property] === parent[property]);
              };
            }
            members = null;
            return isProperty.call(this, property);
          };
        }
  
        // Internal: Normalizes the `for...in` iteration algorithm across
        // environments. Each enumerated key is yielded to a `callback` function.
        forEach = function (object, callback) {
          var size = 0, Properties, members, property;
  
          // Tests for bugs in the current environment's `for...in` algorithm. The
          // `valueOf` property inherits the non-enumerable flag from
          // `Object.prototype` in older versions of IE, Netscape, and Mozilla.
          (Properties = function () {
            this.valueOf = 0;
          }).prototype.valueOf = 0;
  
          // Iterate over a new instance of the `Properties` class.
          members = new Properties();
          for (property in members) {
            // Ignore all properties inherited from `Object.prototype`.
            if (isProperty.call(members, property)) {
              size++;
            }
          }
          Properties = members = null;
  
          // Normalize the iteration algorithm.
          if (!size) {
            // A list of non-enumerable properties inherited from `Object.prototype`.
            members = ["valueOf", "toString", "toLocaleString", "propertyIsEnumerable", "isPrototypeOf", "hasOwnProperty", "constructor"];
            // IE <= 8, Mozilla 1.0, and Netscape 6.2 ignore shadowed non-enumerable
            // properties.
            forEach = function (object, callback) {
              var isFunction = getClass.call(object) == functionClass, property, length;
              var hasProperty = !isFunction && typeof object.constructor != "function" && objectTypes[typeof object.hasOwnProperty] && object.hasOwnProperty || isProperty;
              for (property in object) {
                // Gecko <= 1.0 enumerates the `prototype` property of functions under
                // certain conditions; IE does not.
                if (!(isFunction && property == "prototype") && hasProperty.call(object, property)) {
                  callback(property);
                }
              }
              // Manually invoke the callback for each non-enumerable property.
              for (length = members.length; property = members[--length]; hasProperty.call(object, property) && callback(property));
            };
          } else if (size == 2) {
            // Safari <= 2.0.4 enumerates shadowed properties twice.
            forEach = function (object, callback) {
              // Create a set of iterated properties.
              var members = {}, isFunction = getClass.call(object) == functionClass, property;
              for (property in object) {
                // Store each property name to prevent double enumeration. The
                // `prototype` property of functions is not enumerated due to cross-
                // environment inconsistencies.
                if (!(isFunction && property == "prototype") && !isProperty.call(members, property) && (members[property] = 1) && isProperty.call(object, property)) {
                  callback(property);
                }
              }
            };
          } else {
            // No bugs detected; use the standard `for...in` algorithm.
            forEach = function (object, callback) {
              var isFunction = getClass.call(object) == functionClass, property, isConstructor;
              for (property in object) {
                if (!(isFunction && property == "prototype") && isProperty.call(object, property) && !(isConstructor = property === "constructor")) {
                  callback(property);
                }
              }
              // Manually invoke the callback for the `constructor` property due to
              // cross-environment inconsistencies.
              if (isConstructor || isProperty.call(object, (property = "constructor"))) {
                callback(property);
              }
            };
          }
          return forEach(object, callback);
        };
  
        // Public: Serializes a JavaScript `value` as a JSON string. The optional
        // `filter` argument may specify either a function that alters how object and
        // array members are serialized, or an array of strings and numbers that
        // indicates which properties should be serialized. The optional `width`
        // argument may be either a string or number that specifies the indentation
        // level of the output.
        if (!has("json-stringify")) {
          // Internal: A map of control characters and their escaped equivalents.
          var Escapes = {
            92: "\\\\",
            34: '\\"',
            8: "\\b",
            12: "\\f",
            10: "\\n",
            13: "\\r",
            9: "\\t"
          };
  
          // Internal: Converts `value` into a zero-padded string such that its
          // length is at least equal to `width`. The `width` must be <= 6.
          var leadingZeroes = "000000";
          var toPaddedString = function (width, value) {
            // The `|| 0` expression is necessary to work around a bug in
            // Opera <= 7.54u2 where `0 == -0`, but `String(-0) !== "0"`.
            return (leadingZeroes + (value || 0)).slice(-width);
          };
  
          // Internal: Double-quotes a string `value`, replacing all ASCII control
          // characters (characters with code unit values between 0 and 31) with
          // their escaped equivalents. This is an implementation of the
          // `Quote(value)` operation defined in ES 5.1 section 15.12.3.
          var unicodePrefix = "\\u00";
          var quote = function (value) {
            var result = '"', index = 0, length = value.length, useCharIndex = !charIndexBuggy || length > 10;
            var symbols = useCharIndex && (charIndexBuggy ? value.split("") : value);
            for (; index < length; index++) {
              var charCode = value.charCodeAt(index);
              // If the character is a control character, append its Unicode or
              // shorthand escape sequence; otherwise, append the character as-is.
              switch (charCode) {
                case 8: case 9: case 10: case 12: case 13: case 34: case 92:
                  result += Escapes[charCode];
                  break;
                default:
                  if (charCode < 32) {
                    result += unicodePrefix + toPaddedString(2, charCode.toString(16));
                    break;
                  }
                  result += useCharIndex ? symbols[index] : value.charAt(index);
              }
            }
            return result + '"';
          };
  
          // Internal: Recursively serializes an object. Implements the
          // `Str(key, holder)`, `JO(value)`, and `JA(value)` operations.
          var serialize = function (property, object, callback, properties, whitespace, indentation, stack) {
            var value, className, year, month, date, time, hours, minutes, seconds, milliseconds, results, element, index, length, prefix, result;
            try {
              // Necessary for host object support.
              value = object[property];
            } catch (exception) {}
            if (typeof value == "object" && value) {
              className = getClass.call(value);
              if (className == dateClass && !isProperty.call(value, "toJSON")) {
                if (value > -1 / 0 && value < 1 / 0) {
                  // Dates are serialized according to the `Date#toJSON` method
                  // specified in ES 5.1 section 15.9.5.44. See section 15.9.1.15
                  // for the ISO 8601 date time string format.
                  if (getDay) {
                    // Manually compute the year, month, date, hours, minutes,
                    // seconds, and milliseconds if the `getUTC*` methods are
                    // buggy. Adapted from @Yaffle's `date-shim` project.
                    date = floor(value / 864e5);
                    for (year = floor(date / 365.2425) + 1970 - 1; getDay(year + 1, 0) <= date; year++);
                    for (month = floor((date - getDay(year, 0)) / 30.42); getDay(year, month + 1) <= date; month++);
                    date = 1 + date - getDay(year, month);
                    // The `time` value specifies the time within the day (see ES
                    // 5.1 section 15.9.1.2). The formula `(A % B + B) % B` is used
                    // to compute `A modulo B`, as the `%` operator does not
                    // correspond to the `modulo` operation for negative numbers.
                    time = (value % 864e5 + 864e5) % 864e5;
                    // The hours, minutes, seconds, and milliseconds are obtained by
                    // decomposing the time within the day. See section 15.9.1.10.
                    hours = floor(time / 36e5) % 24;
                    minutes = floor(time / 6e4) % 60;
                    seconds = floor(time / 1e3) % 60;
                    milliseconds = time % 1e3;
                  } else {
                    year = value.getUTCFullYear();
                    month = value.getUTCMonth();
                    date = value.getUTCDate();
                    hours = value.getUTCHours();
                    minutes = value.getUTCMinutes();
                    seconds = value.getUTCSeconds();
                    milliseconds = value.getUTCMilliseconds();
                  }
                  // Serialize extended years correctly.
                  value = (year <= 0 || year >= 1e4 ? (year < 0 ? "-" : "+") + toPaddedString(6, year < 0 ? -year : year) : toPaddedString(4, year)) +
                    "-" + toPaddedString(2, month + 1) + "-" + toPaddedString(2, date) +
                    // Months, dates, hours, minutes, and seconds should have two
                    // digits; milliseconds should have three.
                    "T" + toPaddedString(2, hours) + ":" + toPaddedString(2, minutes) + ":" + toPaddedString(2, seconds) +
                    // Milliseconds are optional in ES 5.0, but required in 5.1.
                    "." + toPaddedString(3, milliseconds) + "Z";
                } else {
                  value = null;
                }
              } else if (typeof value.toJSON == "function" && ((className != numberClass && className != stringClass && className != arrayClass) || isProperty.call(value, "toJSON"))) {
                // Prototype <= 1.6.1 adds non-standard `toJSON` methods to the
                // `Number`, `String`, `Date`, and `Array` prototypes. JSON 3
                // ignores all `toJSON` methods on these objects unless they are
                // defined directly on an instance.
                value = value.toJSON(property);
              }
            }
            if (callback) {
              // If a replacement function was provided, call it to obtain the value
              // for serialization.
              value = callback.call(object, property, value);
            }
            if (value === null) {
              return "null";
            }
            className = getClass.call(value);
            if (className == booleanClass) {
              // Booleans are represented literally.
              return "" + value;
            } else if (className == numberClass) {
              // JSON numbers must be finite. `Infinity` and `NaN` are serialized as
              // `"null"`.
              return value > -1 / 0 && value < 1 / 0 ? "" + value : "null";
            } else if (className == stringClass) {
              // Strings are double-quoted and escaped.
              return quote("" + value);
            }
            // Recursively serialize objects and arrays.
            if (typeof value == "object") {
              // Check for cyclic structures. This is a linear search; performance
              // is inversely proportional to the number of unique nested objects.
              for (length = stack.length; length--;) {
                if (stack[length] === value) {
                  // Cyclic structures cannot be serialized by `JSON.stringify`.
                  throw TypeError();
                }
              }
              // Add the object to the stack of traversed objects.
              stack.push(value);
              results = [];
              // Save the current indentation level and indent one additional level.
              prefix = indentation;
              indentation += whitespace;
              if (className == arrayClass) {
                // Recursively serialize array elements.
                for (index = 0, length = value.length; index < length; index++) {
                  element = serialize(index, value, callback, properties, whitespace, indentation, stack);
                  results.push(element === undef ? "null" : element);
                }
                result = results.length ? (whitespace ? "[\n" + indentation + results.join(",\n" + indentation) + "\n" + prefix + "]" : ("[" + results.join(",") + "]")) : "[]";
              } else {
                // Recursively serialize object members. Members are selected from
                // either a user-specified list of property names, or the object
                // itself.
                forEach(properties || value, function (property) {
                  var element = serialize(property, value, callback, properties, whitespace, indentation, stack);
                  if (element !== undef) {
                    // According to ES 5.1 section 15.12.3: "If `gap` {whitespace}
                    // is not the empty string, let `member` {quote(property) + ":"}
                    // be the concatenation of `member` and the `space` character."
                    // The "`space` character" refers to the literal space
                    // character, not the `space` {width} argument provided to
                    // `JSON.stringify`.
                    results.push(quote(property) + ":" + (whitespace ? " " : "") + element);
                  }
                });
                result = results.length ? (whitespace ? "{\n" + indentation + results.join(",\n" + indentation) + "\n" + prefix + "}" : ("{" + results.join(",") + "}")) : "{}";
              }
              // Remove the object from the traversed object stack.
              stack.pop();
              return result;
            }
          };
  
          // Public: `JSON.stringify`. See ES 5.1 section 15.12.3.
          exports.stringify = function (source, filter, width) {
            var whitespace, callback, properties, className;
            if (objectTypes[typeof filter] && filter) {
              if ((className = getClass.call(filter)) == functionClass) {
                callback = filter;
              } else if (className == arrayClass) {
                // Convert the property names array into a makeshift set.
                properties = {};
                for (var index = 0, length = filter.length, value; index < length; value = filter[index++], ((className = getClass.call(value)), className == stringClass || className == numberClass) && (properties[value] = 1));
              }
            }
            if (width) {
              if ((className = getClass.call(width)) == numberClass) {
                // Convert the `width` to an integer and create a string containing
                // `width` number of space characters.
                if ((width -= width % 1) > 0) {
                  for (whitespace = "", width > 10 && (width = 10); whitespace.length < width; whitespace += " ");
                }
              } else if (className == stringClass) {
                whitespace = width.length <= 10 ? width : width.slice(0, 10);
              }
            }
            // Opera <= 7.54u2 discards the values associated with empty string keys
            // (`""`) only if they are used directly within an object member list
            // (e.g., `!("" in { "": 1})`).
            return serialize("", (value = {}, value[""] = source, value), callback, properties, whitespace, "", []);
          };
        }
  
        // Public: Parses a JSON source string.
        if (!has("json-parse")) {
          var fromCharCode = String.fromCharCode;
  
          // Internal: A map of escaped control characters and their unescaped
          // equivalents.
          var Unescapes = {
            92: "\\",
            34: '"',
            47: "/",
            98: "\b",
            116: "\t",
            110: "\n",
            102: "\f",
            114: "\r"
          };
  
          // Internal: Stores the parser state.
          var Index, Source;
  
          // Internal: Resets the parser state and throws a `SyntaxError`.
          var abort = function () {
            Index = Source = null;
            throw SyntaxError();
          };
  
          // Internal: Returns the next token, or `"$"` if the parser has reached
          // the end of the source string. A token may be a string, number, `null`
          // literal, or Boolean literal.
          var lex = function () {
            var source = Source, length = source.length, value, begin, position, isSigned, charCode;
            while (Index < length) {
              charCode = source.charCodeAt(Index);
              switch (charCode) {
                case 9: case 10: case 13: case 32:
                  // Skip whitespace tokens, including tabs, carriage returns, line
                  // feeds, and space characters.
                  Index++;
                  break;
                case 123: case 125: case 91: case 93: case 58: case 44:
                  // Parse a punctuator token (`{`, `}`, `[`, `]`, `:`, or `,`) at
                  // the current position.
                  value = charIndexBuggy ? source.charAt(Index) : source[Index];
                  Index++;
                  return value;
                case 34:
                  // `"` delimits a JSON string; advance to the next character and
                  // begin parsing the string. String tokens are prefixed with the
                  // sentinel `@` character to distinguish them from punctuators and
                  // end-of-string tokens.
                  for (value = "@", Index++; Index < length;) {
                    charCode = source.charCodeAt(Index);
                    if (charCode < 32) {
                      // Unescaped ASCII control characters (those with a code unit
                      // less than the space character) are not permitted.
                      abort();
                    } else if (charCode == 92) {
                      // A reverse solidus (`\`) marks the beginning of an escaped
                      // control character (including `"`, `\`, and `/`) or Unicode
                      // escape sequence.
                      charCode = source.charCodeAt(++Index);
                      switch (charCode) {
                        case 92: case 34: case 47: case 98: case 116: case 110: case 102: case 114:
                          // Revive escaped control characters.
                          value += Unescapes[charCode];
                          Index++;
                          break;
                        case 117:
                          // `\u` marks the beginning of a Unicode escape sequence.
                          // Advance to the first character and validate the
                          // four-digit code point.
                          begin = ++Index;
                          for (position = Index + 4; Index < position; Index++) {
                            charCode = source.charCodeAt(Index);
                            // A valid sequence comprises four hexdigits (case-
                            // insensitive) that form a single hexadecimal value.
                            if (!(charCode >= 48 && charCode <= 57 || charCode >= 97 && charCode <= 102 || charCode >= 65 && charCode <= 70)) {
                              // Invalid Unicode escape sequence.
                              abort();
                            }
                          }
                          // Revive the escaped character.
                          value += fromCharCode("0x" + source.slice(begin, Index));
                          break;
                        default:
                          // Invalid escape sequence.
                          abort();
                      }
                    } else {
                      if (charCode == 34) {
                        // An unescaped double-quote character marks the end of the
                        // string.
                        break;
                      }
                      charCode = source.charCodeAt(Index);
                      begin = Index;
                      // Optimize for the common case where a string is valid.
                      while (charCode >= 32 && charCode != 92 && charCode != 34) {
                        charCode = source.charCodeAt(++Index);
                      }
                      // Append the string as-is.
                      value += source.slice(begin, Index);
                    }
                  }
                  if (source.charCodeAt(Index) == 34) {
                    // Advance to the next character and return the revived string.
                    Index++;
                    return value;
                  }
                  // Unterminated string.
                  abort();
                default:
                  // Parse numbers and literals.
                  begin = Index;
                  // Advance past the negative sign, if one is specified.
                  if (charCode == 45) {
                    isSigned = true;
                    charCode = source.charCodeAt(++Index);
                  }
                  // Parse an integer or floating-point value.
                  if (charCode >= 48 && charCode <= 57) {
                    // Leading zeroes are interpreted as octal literals.
                    if (charCode == 48 && ((charCode = source.charCodeAt(Index + 1)), charCode >= 48 && charCode <= 57)) {
                      // Illegal octal literal.
                      abort();
                    }
                    isSigned = false;
                    // Parse the integer component.
                    for (; Index < length && ((charCode = source.charCodeAt(Index)), charCode >= 48 && charCode <= 57); Index++);
                    // Floats cannot contain a leading decimal point; however, this
                    // case is already accounted for by the parser.
                    if (source.charCodeAt(Index) == 46) {
                      position = ++Index;
                      // Parse the decimal component.
                      for (; position < length && ((charCode = source.charCodeAt(position)), charCode >= 48 && charCode <= 57); position++);
                      if (position == Index) {
                        // Illegal trailing decimal.
                        abort();
                      }
                      Index = position;
                    }
                    // Parse exponents. The `e` denoting the exponent is
                    // case-insensitive.
                    charCode = source.charCodeAt(Index);
                    if (charCode == 101 || charCode == 69) {
                      charCode = source.charCodeAt(++Index);
                      // Skip past the sign following the exponent, if one is
                      // specified.
                      if (charCode == 43 || charCode == 45) {
                        Index++;
                      }
                      // Parse the exponential component.
                      for (position = Index; position < length && ((charCode = source.charCodeAt(position)), charCode >= 48 && charCode <= 57); position++);
                      if (position == Index) {
                        // Illegal empty exponent.
                        abort();
                      }
                      Index = position;
                    }
                    // Coerce the parsed value to a JavaScript number.
                    return +source.slice(begin, Index);
                  }
                  // A negative sign may only precede numbers.
                  if (isSigned) {
                    abort();
                  }
                  // `true`, `false`, and `null` literals.
                  if (source.slice(Index, Index + 4) == "true") {
                    Index += 4;
                    return true;
                  } else if (source.slice(Index, Index + 5) == "false") {
                    Index += 5;
                    return false;
                  } else if (source.slice(Index, Index + 4) == "null") {
                    Index += 4;
                    return null;
                  }
                  // Unrecognized token.
                  abort();
              }
            }
            // Return the sentinel `$` character if the parser has reached the end
            // of the source string.
            return "$";
          };
  
          // Internal: Parses a JSON `value` token.
          var get = function (value) {
            var results, hasMembers;
            if (value == "$") {
              // Unexpected end of input.
              abort();
            }
            if (typeof value == "string") {
              if ((charIndexBuggy ? value.charAt(0) : value[0]) == "@") {
                // Remove the sentinel `@` character.
                return value.slice(1);
              }
              // Parse object and array literals.
              if (value == "[") {
                // Parses a JSON array, returning a new JavaScript array.
                results = [];
                for (;; hasMembers || (hasMembers = true)) {
                  value = lex();
                  // A closing square bracket marks the end of the array literal.
                  if (value == "]") {
                    break;
                  }
                  // If the array literal contains elements, the current token
                  // should be a comma separating the previous element from the
                  // next.
                  if (hasMembers) {
                    if (value == ",") {
                      value = lex();
                      if (value == "]") {
                        // Unexpected trailing `,` in array literal.
                        abort();
                      }
                    } else {
                      // A `,` must separate each array element.
                      abort();
                    }
                  }
                  // Elisions and leading commas are not permitted.
                  if (value == ",") {
                    abort();
                  }
                  results.push(get(value));
                }
                return results;
              } else if (value == "{") {
                // Parses a JSON object, returning a new JavaScript object.
                results = {};
                for (;; hasMembers || (hasMembers = true)) {
                  value = lex();
                  // A closing curly brace marks the end of the object literal.
                  if (value == "}") {
                    break;
                  }
                  // If the object literal contains members, the current token
                  // should be a comma separator.
                  if (hasMembers) {
                    if (value == ",") {
                      value = lex();
                      if (value == "}") {
                        // Unexpected trailing `,` in object literal.
                        abort();
                      }
                    } else {
                      // A `,` must separate each object member.
                      abort();
                    }
                  }
                  // Leading commas are not permitted, object property names must be
                  // double-quoted strings, and a `:` must separate each property
                  // name and value.
                  if (value == "," || typeof value != "string" || (charIndexBuggy ? value.charAt(0) : value[0]) != "@" || lex() != ":") {
                    abort();
                  }
                  results[value.slice(1)] = get(lex());
                }
                return results;
              }
              // Unexpected token encountered.
              abort();
            }
            return value;
          };
  
          // Internal: Updates a traversed object member.
          var update = function (source, property, callback) {
            var element = walk(source, property, callback);
            if (element === undef) {
              delete source[property];
            } else {
              source[property] = element;
            }
          };
  
          // Internal: Recursively traverses a parsed JSON object, invoking the
          // `callback` function for each value. This is an implementation of the
          // `Walk(holder, name)` operation defined in ES 5.1 section 15.12.2.
          var walk = function (source, property, callback) {
            var value = source[property], length;
            if (typeof value == "object" && value) {
              // `forEach` can't be used to traverse an array in Opera <= 8.54
              // because its `Object#hasOwnProperty` implementation returns `false`
              // for array indices (e.g., `![1, 2, 3].hasOwnProperty("0")`).
              if (getClass.call(value) == arrayClass) {
                for (length = value.length; length--;) {
                  update(value, length, callback);
                }
              } else {
                forEach(value, function (property) {
                  update(value, property, callback);
                });
              }
            }
            return callback.call(source, property, value);
          };
  
          // Public: `JSON.parse`. See ES 5.1 section 15.12.2.
          exports.parse = function (source, callback) {
            var result, value;
            Index = 0;
            Source = "" + source;
            result = get(lex());
            // If a JSON string contains multiple tokens, it is invalid.
            if (lex() != "$") {
              abort();
            }
            // Reset the parser state.
            Index = Source = null;
            return callback && getClass.call(callback) == functionClass ? walk((value = {}, value[""] = result, value), "", callback) : result;
          };
        }
      }
  
      exports["runInContext"] = runInContext;
      return exports;
    }
  
    if (freeExports && !isLoader) {
      // Export for CommonJS environments.
      runInContext(root, freeExports);
    } else {
      // Export for web browsers and JavaScript engines.
      var nativeJSON = root.JSON,
          previousJSON = root["JSON3"],
          isRestored = false;
  
      var JSON3 = runInContext(root, (root["JSON3"] = {
        // Public: Restores the original value of the global `JSON` object and
        // returns a reference to the `JSON3` object.
        "noConflict": function () {
          if (!isRestored) {
            isRestored = true;
            root.JSON = nativeJSON;
            root["JSON3"] = previousJSON;
            nativeJSON = previousJSON = null;
          }
          return JSON3;
        }
      }));
  
      root.JSON = {
        "parse": JSON3.parse,
        "stringify": JSON3.stringify
      };
    }
  
    // Export for asynchronous module loaders.
    if (isLoader) {
      define(function () {
        return JSON3;
      });
    }
  }).call(this);
  