/node_modules/grunt-contrib-jshint/node_modules/jshint/tests/stable/regression/libs/lodash.js

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/*!
 * Lo-Dash v0.6.1 <http://lodash.com>
 * Copyright 2012 John-David Dalton <http://allyoucanleet.com/>
 * Based on Underscore.js 1.3.3, copyright 2009-2012 Jeremy Ashkenas, DocumentCloud Inc.
 * <http://documentcloud.github.com/underscore>
 * Available under MIT license <http://lodash.com/license>
 */
;(function(window, undefined) {
  'use strict';

  /**
   * Used to cache the last `_.templateSettings.evaluate` delimiter to avoid
   * unnecessarily assigning `reEvaluateDelimiter` a new generated regexp.
   * Assigned in `_.template`.
   */
  var lastEvaluateDelimiter;

  /**
   * Used to cache the last template `options.variable` to avoid unnecessarily
   * assigning `reDoubleVariable` a new generated regexp. Assigned in `_.template`.
   */
  var lastVariable;

  /**
   * Used to match potentially incorrect data object references, like `obj.obj`,
   * in compiled templates. Assigned in `_.template`.
   */
  var reDoubleVariable;

  /**
   * Used to match "evaluate" delimiters, including internal delimiters,
   * in template text. Assigned in `_.template`.
   */
  var reEvaluateDelimiter;

  /** Detect free variable `exports` */
  var freeExports = typeof exports == 'object' && exports &&
    (typeof global == 'object' && global && global == global.global && (window = global), exports);

  /** Native prototype shortcuts */
  var ArrayProto = Array.prototype,
      BoolProto = Boolean.prototype,
      ObjectProto = Object.prototype,
      NumberProto = Number.prototype,
      StringProto = String.prototype;

  /** Used to generate unique IDs */
  var idCounter = 0;

  /** Used by `cachedContains` as the default size when optimizations are enabled for large arrays */
  var largeArraySize = 30;

  /** Used to restore the original `_` reference in `noConflict` */
  var oldDash = window._;

  /** Used to detect delimiter values that should be processed by `tokenizeEvaluate` */
  var reComplexDelimiter = /[-+=!~*%&^<>|{(\/]|\[\D|\b(?:delete|in|instanceof|new|typeof|void)\b/;

  /** Used to match HTML entities */
  var reEscapedHtml = /&(?:amp|lt|gt|quot|#x27);/g;

  /** Used to match empty string literals in compiled template source */
  var reEmptyStringLeading = /\b__p \+= '';/g,
      reEmptyStringMiddle = /\b(__p \+=) '' \+/g,
      reEmptyStringTrailing = /(__e\(.*?\)|\b__t\)) \+\n'';/g;

  /** Used to match regexp flags from their coerced string values */
  var reFlags = /\w*$/;

  /** Used to insert the data object variable into compiled template source */
  var reInsertVariable = /(?:__e|__t = )\(\s*(?![\d\s"']|this\.)/g;

  /** Used to detect if a method is native */
  var reNative = RegExp('^' +
    (ObjectProto.valueOf + '')
      .replace(/[.*+?^=!:${}()|[\]\/\\]/g, '\\$&')
      .replace(/valueOf|for [^\]]+/g, '.+?') + '$'
  );

  /** Used to match internally used tokens in template text */
  var reToken = /__token(\d+)__/g;

  /** Used to match HTML characters */
  var reUnescapedHtml = /[&<>"']/g;

  /** Used to match unescaped characters in compiled string literals */
  var reUnescapedString = /['\n\r\t\u2028\u2029\\]/g;

  /** Used to fix the JScript [[DontEnum]] bug */
  var shadowed = [
    'constructor', 'hasOwnProperty', 'isPrototypeOf', 'propertyIsEnumerable',
    'toLocaleString', 'toString', 'valueOf'
  ];

  /** Used to make template sourceURLs easier to identify */
  var templateCounter = 0;

  /** Used to replace template delimiters */
  var tokenHead = '__token',
      tokenFoot = '__';

  /** Used to store tokenized template text snippets */
  var tokenized = [];

  /** Native method shortcuts */
  var concat = ArrayProto.concat,
      hasOwnProperty = ObjectProto.hasOwnProperty,
      push = ArrayProto.push,
      propertyIsEnumerable = ObjectProto.propertyIsEnumerable,
      slice = ArrayProto.slice,
      toString = ObjectProto.toString;

  /* Native method shortcuts for methods with the same name as other `lodash` methods */
  var nativeBind = reNative.test(nativeBind = slice.bind) && nativeBind,
      nativeFloor = Math.floor,
      nativeIsArray = reNative.test(nativeIsArray = Array.isArray) && nativeIsArray,
      nativeIsFinite = window.isFinite,
      nativeKeys = reNative.test(nativeKeys = Object.keys) && nativeKeys,
      nativeMax = Math.max,
      nativeMin = Math.min,
      nativeRandom = Math.random;

  /** `Object#toString` result shortcuts */
  var argsClass = '[object Arguments]',
      arrayClass = '[object Array]',
      boolClass = '[object Boolean]',
      dateClass = '[object Date]',
      funcClass = '[object Function]',
      numberClass = '[object Number]',
      objectClass = '[object Object]',
      regexpClass = '[object RegExp]',
      stringClass = '[object String]';

  /** Timer shortcuts */
  var clearTimeout = window.clearTimeout,
      setTimeout = window.setTimeout;

  /**
   * Detect the JScript [[DontEnum]] bug:
   *
   * In IE < 9 an objects own properties, shadowing non-enumerable ones, are
   * made non-enumerable as well.
   */
  var hasDontEnumBug;

  /**
   * Detect if `Array#shift` and `Array#splice` augment array-like objects
   * incorrectly:
   *
   * Firefox < 10, IE compatibility mode, and IE < 9 have buggy Array `shift()`
   * and `splice()` functions that fail to remove the last element, `value[0]`,
   * of array-like objects even though the `length` property is set to `0`.
   * The `shift()` method is buggy in IE 8 compatibility mode, while `splice()`
   * is buggy regardless of mode in IE < 9 and buggy in compatibility mode in IE 9.
   */
  var hasObjectSpliceBug;

  /** Detect if own properties are iterated after inherited properties (IE < 9) */
  var iteratesOwnLast;

  /** Detect if an `arguments` object's indexes are non-enumerable (IE < 9) */
  var noArgsEnum = true;

  (function() {
    var object = { '0': 1, 'length': 1 },
        props = [];

    function ctor() { this.x = 1; }
    ctor.prototype = { 'valueOf': 1, 'y': 1 };
    for (var prop in new ctor) { props.push(prop); }
    for (prop in arguments) { noArgsEnum = !prop; }

    hasDontEnumBug = (props + '').length < 4;
    iteratesOwnLast = props[0] != 'x';
    hasObjectSpliceBug = (props.splice.call(object, 0, 1), object[0]);
  }(1));

  /** Detect if an `arguments` object's [[Class]] is unresolvable (Firefox < 4, IE < 9) */
  var noArgsClass = !isArguments(arguments);

  /** Detect if `Array#slice` cannot be used to convert strings to arrays (Opera < 10.52) */
  var noArraySliceOnStrings = slice.call('x')[0] != 'x';

  /**
   * Detect lack of support for accessing string characters by index:
   *
   * IE < 8 can't access characters by index and IE 8 can only access
   * characters by index on string literals.
   */
  var noCharByIndex = ('x'[0] + Object('x')[0]) != 'xx';

  /**
   * Detect if a node's [[Class]] is unresolvable (IE < 9)
   * and that the JS engine won't error when attempting to coerce an object to
   * a string without a `toString` property value of `typeof` "function".
   */
  try {
    var noNodeClass = ({ 'toString': 0 } + '', toString.call(window.document || 0) == objectClass);
  } catch(e) { }

  /* Detect if `Function#bind` exists and is inferred to be fast (all but V8) */
  var isBindFast = nativeBind && /\n|Opera/.test(nativeBind + toString.call(window.opera));

  /* Detect if `Object.keys` exists and is inferred to be fast (IE, Opera, V8) */
  var isKeysFast = nativeKeys && /^.+$|true/.test(nativeKeys + !!window.attachEvent);

  /* Detect if strict mode, "use strict", is inferred to be fast (V8) */
  var isStrictFast = !isBindFast;

  /**
   * Detect if sourceURL syntax is usable without erroring:
   *
   * The JS engine in Adobe products, like InDesign, will throw a syntax error
   * when it encounters a single line comment beginning with the `@` symbol.
   *
   * The JS engine in Narwhal will generate the function `function anonymous(){//}`
   * and throw a syntax error.
   *
   * Avoid comments beginning `@` symbols in IE because they are part of its
   * non-standard conditional compilation support.
   * http://msdn.microsoft.com/en-us/library/121hztk3(v=vs.94).aspx
   */
  try {
    var useSourceURL = (Function('//@')(), !window.attachEvent);
  } catch(e){ }

  /** Used to identify object classifications that are array-like */
  var arrayLikeClasses = {};
  arrayLikeClasses[boolClass] = arrayLikeClasses[dateClass] = arrayLikeClasses[funcClass] =
  arrayLikeClasses[numberClass] = arrayLikeClasses[objectClass] = arrayLikeClasses[regexpClass] = false;
  arrayLikeClasses[argsClass] = arrayLikeClasses[arrayClass] = arrayLikeClasses[stringClass] = true;

  /** Used to identify object classifications that `_.clone` supports */
  var cloneableClasses = {};
  cloneableClasses[argsClass] = cloneableClasses[funcClass] = false;
  cloneableClasses[arrayClass] = cloneableClasses[boolClass] = cloneableClasses[dateClass] =
  cloneableClasses[numberClass] = cloneableClasses[objectClass] = cloneableClasses[regexpClass] =
  cloneableClasses[stringClass] = true;

  /**
   * Used to convert characters to HTML entities:
   *
   * Though the `>` character is escaped for symmetry, characters like `>` and `/`
   * don't require escaping in HTML and have no special meaning unless they're part
   * of a tag or an unquoted attribute value.
   * http://mathiasbynens.be/notes/ambiguous-ampersands (under "semi-related fun fact")
   */
  var htmlEscapes = {
    '&': '&amp;',
    '<': '&lt;',
    '>': '&gt;',
    '"': '&quot;',
    "'": '&#x27;'
  };

  /** Used to convert HTML entities to characters */
  var htmlUnescapes = {
    '&amp;': '&',
    '&lt;': '<',
    '&gt;': '>',
    '&quot;': '"',
    '&#x27;': "'"
  };

  /** Used to determine if values are of the language type Object */
  var objectTypes = {
    'boolean': false,
    'function': true,
    'object': true,
    'number': false,
    'string': false,
    'undefined': false,
    'unknown': true
  };

  /** Used to escape characters for inclusion in compiled string literals */
  var stringEscapes = {
    '\\': '\\',
    "'": "'",
    '\n': 'n',
    '\r': 'r',
    '\t': 't',
    '\u2028': 'u2028',
    '\u2029': 'u2029'
  };

  /*--------------------------------------------------------------------------*/

  /**
   * The `lodash` function.
   *
   * @name _
   * @constructor
   * @param {Mixed} value The value to wrap in a `LoDash` instance.
   * @returns {Object} Returns a `LoDash` instance.
   */
  function lodash(value) {
    // allow invoking `lodash` without the `new` operator
    return new LoDash(value);
  }

  /**
   * Creates a `LoDash` instance that wraps a value to allow chaining.
   *
   * @private
   * @constructor
   * @param {Mixed} value The value to wrap.
   */
  function LoDash(value) {
    // exit early if already wrapped
    if (value && value.__wrapped__) {
      return value;
    }
    this.__wrapped__ = value;
  }

  /**
   * By default, the template delimiters used by Lo-Dash are similar to those in
   * embedded Ruby (ERB). Change the following template settings to use alternative
   * delimiters.
   *
   * @static
   * @memberOf _
   * @type Object
   */
  lodash.templateSettings = {

    /**
     * Used to detect `data` property values to be HTML-escaped.
     *
     * @static
     * @memberOf _.templateSettings
     * @type RegExp
     */
    'escape': /<%-([\s\S]+?)%>/g,

    /**
     * Used to detect code to be evaluated.
     *
     * @static
     * @memberOf _.templateSettings
     * @type RegExp
     */
    'evaluate': /<%([\s\S]+?)%>/g,

    /**
     * Used to detect `data` property values to inject.
     *
     * @static
     * @memberOf _.templateSettings
     * @type RegExp
     */
    'interpolate': /<%=([\s\S]+?)%>/g,

    /**
     * Used to reference the data object in the template text.
     *
     * @static
     * @memberOf _.templateSettings
     * @type String
     */
    'variable': ''
  };

  /*--------------------------------------------------------------------------*/

  /**
   * The template used to create iterator functions.
   *
   * @private
   * @param {Obect} data The data object used to populate the text.
   * @returns {String} Returns the interpolated text.
   */
  var iteratorTemplate = template(
    // conditional strict mode
    '<% if (useStrict) { %>\'use strict\';\n<% } %>' +

    // the `iteratee` may be reassigned by the `top` snippet
    'var index, value, iteratee = <%= firstArg %>, ' +
    // assign the `result` variable an initial value
    'result<% if (init) { %> = <%= init %><% } %>;\n' +
    // add code to exit early or do so if the first argument is falsey
    '<%= exit %>;\n' +
    // add code after the exit snippet but before the iteration branches
    '<%= top %>;\n' +

    // the following branch is for iterating arrays and array-like objects
    '<% if (arrayBranch) { %>' +
    'var length = iteratee.length; index = -1;' +
    '  <% if (objectBranch) { %>\nif (length > -1 && length === length >>> 0) {<% } %>' +

    // add support for accessing string characters by index if needed
    '  <% if (noCharByIndex) { %>\n' +
    '  if (toString.call(iteratee) == stringClass) {\n' +
    '    iteratee = iteratee.split(\'\')\n' +
    '  }' +
    '  <% } %>\n' +

    '  <%= arrayBranch.beforeLoop %>;\n' +
    '  while (++index < length) {\n' +
    '    value = iteratee[index];\n' +
    '    <%= arrayBranch.inLoop %>\n' +
    '  }' +
    '  <% if (objectBranch) { %>\n}<% } %>' +
    '<% } %>' +

    // the following branch is for iterating an object's own/inherited properties
    '<% if (objectBranch) { %>' +
    '  <% if (arrayBranch) { %>\nelse {' +

    // add support for iterating over `arguments` objects if needed
    '  <%  } else if (noArgsEnum) { %>\n' +
    '  var length = iteratee.length; index = -1;\n' +
    '  if (length && isArguments(iteratee)) {\n' +
    '    while (++index < length) {\n' +
    '      value = iteratee[index += \'\'];\n' +
    '      <%= objectBranch.inLoop %>\n' +
    '    }\n' +
    '  } else {' +
    '  <% } %>' +

    // Firefox < 3.6, Opera > 9.50 - Opera < 11.60, and Safari < 5.1
    // (if the prototype or a property on the prototype has been set)
    // incorrectly sets a function's `prototype` property [[Enumerable]]
    // value to `true`. Because of this Lo-Dash standardizes on skipping
    // the the `prototype` property of functions regardless of its
    // [[Enumerable]] value.
    '  <% if (!hasDontEnumBug) { %>\n' +
    '  var skipProto = typeof iteratee == \'function\' && \n' +
    '    propertyIsEnumerable.call(iteratee, \'prototype\');\n' +
    '  <% } %>' +

    // iterate own properties using `Object.keys` if it's fast
    '  <% if (isKeysFast && useHas) { %>\n' +
    '  var ownIndex = -1,\n' +
    '      ownProps = objectTypes[typeof iteratee] ? nativeKeys(iteratee) : [],\n' +
    '      length = ownProps.length;\n\n' +
    '  <%= objectBranch.beforeLoop %>;\n' +
    '  while (++ownIndex < length) {\n' +
    '    index = ownProps[ownIndex];\n' +
    '    <% if (!hasDontEnumBug) { %>if (!(skipProto && index == \'prototype\')) {\n  <% } %>' +
    '    value = iteratee[index];\n' +
    '    <%= objectBranch.inLoop %>\n' +
    '    <% if (!hasDontEnumBug) { %>}\n<% } %>' +
    '  }' +

    // else using a for-in loop
    '  <% } else { %>\n' +
    '  <%= objectBranch.beforeLoop %>;\n' +
    '  for (index in iteratee) {' +
    '    <% if (!hasDontEnumBug || useHas) { %>\n    if (<%' +
    '      if (!hasDontEnumBug) { %>!(skipProto && index == \'prototype\')<% }' +
    '      if (!hasDontEnumBug && useHas) { %> && <% }' +
    '      if (useHas) { %>hasOwnProperty.call(iteratee, index)<% }' +
    '    %>) {' +
    '    <% } %>\n' +
    '    value = iteratee[index];\n' +
    '    <%= objectBranch.inLoop %>;\n' +
    '    <% if (!hasDontEnumBug || useHas) { %>}\n<% } %>' +
    '  }' +
    '  <% } %>' +

    // Because IE < 9 can't set the `[[Enumerable]]` attribute of an
    // existing property and the `constructor` property of a prototype
    // defaults to non-enumerable, Lo-Dash skips the `constructor`
    // property when it infers it's iterating over a `prototype` object.
    '  <% if (hasDontEnumBug) { %>\n\n' +
    '  var ctor = iteratee.constructor;\n' +
    '    <% for (var k = 0; k < 7; k++) { %>\n' +
    '  index = \'<%= shadowed[k] %>\';\n' +
    '  if (<%' +
    '      if (shadowed[k] == \'constructor\') {' +
    '        %>!(ctor && ctor.prototype === iteratee) && <%' +
    '      } %>hasOwnProperty.call(iteratee, index)) {\n' +
    '    value = iteratee[index];\n' +
    '    <%= objectBranch.inLoop %>\n' +
    '  }' +
    '    <% } %>' +
    '  <% } %>' +
    '  <% if (arrayBranch || noArgsEnum) { %>\n}<% } %>' +
    '<% } %>\n' +

    // add code to the bottom of the iteration function
    '<%= bottom %>;\n' +
    // finally, return the `result`
    'return result'
  );

  /**
   * Reusable iterator options shared by
   * `every`, `filter`, `find`, `forEach`, `forIn`, `forOwn`, `groupBy`, `map`,
   * `reject`, `some`, and `sortBy`.
   */
  var baseIteratorOptions = {
    'args': 'collection, callback, thisArg',
    'init': 'collection',
    'top':
      'if (!callback) {\n' +
      '  callback = identity\n' +
      '}\n' +
      'else if (thisArg) {\n' +
      '  callback = iteratorBind(callback, thisArg)\n' +
      '}',
    'inLoop': 'if (callback(value, index, collection) === false) return result'
  };

  /** Reusable iterator options for `countBy`, `groupBy`, and `sortBy` */
  var countByIteratorOptions = {
    'init': '{}',
    'top':
      'var prop;\n' +
      'if (typeof callback != \'function\') {\n' +
      '  var valueProp = callback;\n' +
      '  callback = function(value) { return value[valueProp] }\n' +
      '}\n' +
      'else if (thisArg) {\n' +
      '  callback = iteratorBind(callback, thisArg)\n' +
      '}',
    'inLoop':
      'prop = callback(value, index, collection);\n' +
      '(hasOwnProperty.call(result, prop) ? result[prop]++ : result[prop] = 1)'
  };

  /** Reusable iterator options for `every` and `some` */
  var everyIteratorOptions = {
    'init': 'true',
    'inLoop': 'if (!callback(value, index, collection)) return !result'
  };

  /** Reusable iterator options for `defaults` and `extend` */
  var extendIteratorOptions = {
    'useHas': false,
    'useStrict': false,
    'args': 'object',
    'init': 'object',
    'top':
      'for (var argsIndex = 1, argsLength = arguments.length; argsIndex < argsLength; argsIndex++) {\n' +
      '  if (iteratee = arguments[argsIndex]) {',
    'inLoop': 'result[index] = value',
    'bottom': '  }\n}'
  };

  /** Reusable iterator options for `filter`, `reject`, and `where` */
  var filterIteratorOptions = {
    'init': '[]',
    'inLoop': 'callback(value, index, collection) && result.push(value)'
  };

  /** Reusable iterator options for `find`, `forEach`, `forIn`, and `forOwn` */
  var forEachIteratorOptions = {
    'top': 'if (thisArg) callback = iteratorBind(callback, thisArg)'
  };

  /** Reusable iterator options for `forIn` and `forOwn` */
  var forOwnIteratorOptions = {
    'inLoop': {
      'object': baseIteratorOptions.inLoop
    }
  };

  /** Reusable iterator options for `invoke`, `map`, `pluck`, and `sortBy` */
  var mapIteratorOptions = {
    'init': '',
    'exit': 'if (!collection) return []',
    'beforeLoop': {
      'array':  'result = Array(length)',
      'object': 'result = ' + (isKeysFast ? 'Array(length)' : '[]')
    },
    'inLoop': {
      'array':  'result[index] = callback(value, index, collection)',
      'object': 'result' + (isKeysFast ? '[ownIndex] = ' : '.push') + '(callback(value, index, collection))'
    }
  };

  /** Reusable iterator options for `omit` and `pick` */
  var omitIteratorOptions = {
    'useHas': false,
    'args': 'object, callback, thisArg',
    'init': '{}',
    'top':
      'var isFunc = typeof callback == \'function\';\n' +
      'if (!isFunc) {\n' +
      '  var props = concat.apply(ArrayProto, arguments)\n' +
      '} else if (thisArg) {\n' +
      '  callback = iteratorBind(callback, thisArg)\n' +
      '}',
    'inLoop':
      'if (isFunc\n' +
      '  ? !callback(value, index, object)\n' +
      '  : indexOf(props, index) < 0\n' +
      ') result[index] = value'
  };

  /*--------------------------------------------------------------------------*/

  /**
   * Creates a new function optimized for searching large arrays for a given `value`,
   * starting at `fromIndex`, using strict equality for comparisons, i.e. `===`.
   *
   * @private
   * @param {Array} array The array to search.
   * @param {Mixed} value The value to search for.
   * @param {Number} [fromIndex=0] The index to start searching from.
   * @param {Number} [largeSize=30] The length at which an array is considered large.
   * @returns {Boolean} Returns `true` if `value` is found, else `false`.
   */
  function cachedContains(array, fromIndex, largeSize) {
    fromIndex || (fromIndex = 0);

    var length = array.length,
        isLarge = (length - fromIndex) >= (largeSize || largeArraySize),
        cache = isLarge ? {} : array;

    if (isLarge) {
      // init value cache
      var key,
          index = fromIndex - 1;

      while (++index < length) {
        // manually coerce `value` to string because `hasOwnProperty`, in some
        // older versions of Firefox, coerces objects incorrectly
        key = array[index] + '';
        (hasOwnProperty.call(cache, key) ? cache[key] : (cache[key] = [])).push(array[index]);
      }
    }
    return function(value) {
      if (isLarge) {
        var key = value + '';
        return hasOwnProperty.call(cache, key) && indexOf(cache[key], value) > -1;
      }
      return indexOf(cache, value, fromIndex) > -1;
    }
  }

  /**
   * Creates compiled iteration functions. The iteration function will be created
   * to iterate over only objects if the first argument of `options.args` is
   * "object" or `options.inLoop.array` is falsey.
   *
   * @private
   * @param {Object} [options1, options2, ...] The compile options objects.
   *
   *  useHas - A boolean to specify whether or not to use `hasOwnProperty` checks
   *   in the object loop.
   *
   *  useStrict - A boolean to specify whether or not to include the ES5
   *   "use strict" directive.
   *
   *  args - A string of comma separated arguments the iteration function will
   *   accept.
   *
   *  init - A string to specify the initial value of the `result` variable.
   *
   *  exit - A string of code to use in place of the default exit-early check
   *   of `if (!arguments[0]) return result`.
   *
   *  top - A string of code to execute after the exit-early check but before
   *   the iteration branches.
   *
   *  beforeLoop - A string or object containing an "array" or "object" property
   *   of code to execute before the array or object loops.
   *
   *  inLoop - A string or object containing an "array" or "object" property
   *   of code to execute in the array or object loops.
   *
   *  bottom - A string of code to execute after the iteration branches but
   *   before the `result` is returned.
   *
   * @returns {Function} Returns the compiled function.
   */
  function createIterator() {
    var object,
        prop,
        value,
        index = -1,
        length = arguments.length;

    // merge options into a template data object
    var data = {
      'bottom': '',
      'exit': '',
      'init': '',
      'top': '',
      'arrayBranch': { 'beforeLoop': '' },
      'objectBranch': { 'beforeLoop': '' }
    };

    while (++index < length) {
      object = arguments[index];
      for (prop in object) {
        value = (value = object[prop]) == null ? '' : value;
        // keep this regexp explicit for the build pre-process
        if (/beforeLoop|inLoop/.test(prop)) {
          if (typeof value == 'string') {
            value = { 'array': value, 'object': value };
          }
          data.arrayBranch[prop] = value.array || '';
          data.objectBranch[prop] = value.object || '';
        } else {
          data[prop] = value;
        }
      }
    }
    // set additional template `data` values
    var args = data.args,
        firstArg = /^[^,]+/.exec(args)[0],
        useStrict = data.useStrict;

    data.firstArg = firstArg;
    data.hasDontEnumBug = hasDontEnumBug;
    data.isKeysFast = isKeysFast;
    data.noArgsEnum = noArgsEnum;
    data.shadowed = shadowed;
    data.useHas = data.useHas !== false;
    data.useStrict = useStrict == null ? isStrictFast : useStrict;

    if (data.noCharByIndex == null) {
      data.noCharByIndex = noCharByIndex;
    }
    if (!data.exit) {
      data.exit = 'if (!' + firstArg + ') return result';
    }
    if (firstArg != 'collection' || !data.arrayBranch.inLoop) {
      data.arrayBranch = null;
    }
    // create the function factory
    var factory = Function(
        'arrayLikeClasses, ArrayProto, bind, compareAscending, concat, forIn, ' +
        'hasOwnProperty, identity, indexOf, isArguments, isArray, isFunction, ' +
        'isPlainObject, iteratorBind, objectClass, objectTypes, nativeKeys, ' +
        'propertyIsEnumerable, slice, stringClass, toString',
      'var callee = function(' + args + ') {\n' + iteratorTemplate(data) + '\n};\n' +
      'return callee'
    );
    // return the compiled function
    return factory(
      arrayLikeClasses, ArrayProto, bind, compareAscending, concat, forIn,
      hasOwnProperty, identity, indexOf, isArguments, isArray, isFunction,
      isPlainObject, iteratorBind, objectClass, objectTypes, nativeKeys,
      propertyIsEnumerable, slice, stringClass, toString
    );
  }

  /**
   * Used by `sortBy` to compare transformed `collection` values, stable sorting
   * them in ascending order.
   *
   * @private
   * @param {Object} a The object to compare to `b`.
   * @param {Object} b The object to compare to `a`.
   * @returns {Number} Returns the sort order indicator of `1` or `-1`.
   */
  function compareAscending(a, b) {
    var ai = a.index,
        bi = b.index;

    a = a.criteria;
    b = b.criteria;

    if (a === undefined) {
      return 1;
    }
    if (b === undefined) {
      return -1;
    }
    // ensure a stable sort in V8 and other engines
    // http://code.google.com/p/v8/issues/detail?id=90
    return a < b ? -1 : a > b ? 1 : ai < bi ? -1 : 1;
  }

  /**
   * Used by `template` to replace tokens with their corresponding code snippets.
   *
   * @private
   * @param {String} match The matched token.
   * @param {String} index The `tokenized` index of the code snippet.
   * @returns {String} Returns the code snippet.
   */
  function detokenize(match, index) {
    return tokenized[index];
  }

  /**
   * Used by `template` to escape characters for inclusion in compiled
   * string literals.
   *
   * @private
   * @param {String} match The matched character to escape.
   * @returns {String} Returns the escaped character.
   */
  function escapeStringChar(match) {
    return '\\' + stringEscapes[match];
  }

  /**
   * Used by `escape` to convert characters to HTML entities.
   *
   * @private
   * @param {String} match The matched character to escape.
   * @returns {String} Returns the escaped character.
   */
  function escapeHtmlChar(match) {
    return htmlEscapes[match];
  }

  /**
   * Creates a new function that, when called, invokes `func` with the `this`
   * binding of `thisArg` and the arguments (value, index, object).
   *
   * @private
   * @param {Function} func The function to bind.
   * @param {Mixed} [thisArg] The `this` binding of `func`.
   * @returns {Function} Returns the new bound function.
   */
  function iteratorBind(func, thisArg) {
    return function(value, index, object) {
      return func.call(thisArg, value, index, object);
    };
  }

  /**
   * A no-operation function.
   *
   * @private
   */
  function noop() {
    // no operation performed
  }

  /**
   * Used by `template` to replace "escape" template delimiters with tokens.
   *
   * @private
   * @param {String} match The matched template delimiter.
   * @param {String} value The delimiter value.
   * @returns {String} Returns a token.
   */
  function tokenizeEscape(match, value) {
    if (match && reComplexDelimiter.test(value)) {
      return '<e%-' + value + '%>';
    }
    var index = tokenized.length;
    tokenized[index] = "' +\n__e(" + value + ") +\n'";
    return tokenHead + index + tokenFoot;
  }

  /**
   * Used by `template` to replace "evaluate" template delimiters, or complex
   * "escape" and "interpolate" delimiters, with tokens.
   *
   * @private
   * @param {String} match The matched template delimiter.
   * @param {String} escapeValue The complex "escape" delimiter value.
   * @param {String} interpolateValue The complex "interpolate" delimiter value.
   * @param {String} [evaluateValue] The "evaluate" delimiter value.
   * @returns {String} Returns a token.
   */
  function tokenizeEvaluate(match, escapeValue, interpolateValue, evaluateValue) {
    if (evaluateValue) {
      var index = tokenized.length;
      tokenized[index] = "';\n" + evaluateValue + ";\n__p += '";
      return tokenHead + index + tokenFoot;
    }
    return escapeValue
      ? tokenizeEscape(null, escapeValue)
      : tokenizeInterpolate(null, interpolateValue);
  }

  /**
   * Used by `template` to replace "interpolate" template delimiters with tokens.
   *
   * @private
   * @param {String} match The matched template delimiter.
   * @param {String} value The delimiter value.
   * @returns {String} Returns a token.
   */
  function tokenizeInterpolate(match, value) {
    if (match && reComplexDelimiter.test(value)) {
      return '<e%=' + value + '%>';
    }
    var index = tokenized.length;
    tokenized[index] = "' +\n((__t = (" + value + ")) == null ? '' : __t) +\n'";
    return tokenHead + index + tokenFoot;
  }

  /**
   * Used by `unescape` to convert HTML entities to characters.
   *
   * @private
   * @param {String} match The matched character to unescape.
   * @returns {String} Returns the unescaped character.
   */
  function unescapeHtmlChar(match) {
    return htmlUnescapes[match];
  }

  /*--------------------------------------------------------------------------*/

  /**
   * Checks if `value` is an `arguments` object.
   *
   * @static
   * @memberOf _
   * @category Objects
   * @param {Mixed} value The value to check.
   * @returns {Boolean} Returns `true` if the `value` is an `arguments` object, else `false`.
   * @example
   *
   * (function() { return _.isArguments(arguments); })(1, 2, 3);
   * // => true
   *
   * _.isArguments([1, 2, 3]);
   * // => false
   */
  function isArguments(value) {
    return toString.call(value) == argsClass;
  }
  // fallback for browsers that can't detect `arguments` objects by [[Class]]
  if (noArgsClass) {
    isArguments = function(value) {
      return !!(value && hasOwnProperty.call(value, 'callee'));
    };
  }

  /**
   * Checks if `value` is an array.
   *
   * @static
   * @memberOf _
   * @category Objects
   * @param {Mixed} value The value to check.
   * @returns {Boolean} Returns `true` if the `value` is an array, else `false`.
   * @example
   *
   * (function() { return _.isArray(arguments); })();
   * // => false
   *
   * _.isArray([1, 2, 3]);
   * // => true
   */
  var isArray = nativeIsArray || function(value) {
    return toString.call(value) == arrayClass;
  };

  /**
   * Checks if `value` is a function.
   *
   * @static
   * @memberOf _
   * @category Objects
   * @param {Mixed} value The value to check.
   * @returns {Boolean} Returns `true` if the `value` is a function, else `false`.
   * @example
   *
   * _.isFunction(''.concat);
   * // => true
   */
  function isFunction(value) {
    return typeof value == 'function';
  }
  // fallback for older versions of Chrome and Safari
  if (isFunction(/x/)) {
    isFunction = function(value) {
      return toString.call(value) == funcClass;
    };
  }

  /**
   * A fallback implementation of `isPlainObject`.
   *
   * @private
   * @param {Mixed} value The value to check.
   * @param {Boolean} [skipArgsCheck=false] Internally used to skip checks for
   *  `arguments` objects.
   * @returns {Boolean} Returns `true` if the `value` is a plain `Object` object,
   *  else `false`.
   */
  function isPlainFallback(value, skipArgsCheck) {
    // avoid non-objects and false positives for `arguments` objects
    var result = false;
    if (!(value && typeof value == 'object') || (!skipArgsCheck && isArguments(value))) {
      return result;
    }
    // IE < 9 presents DOM nodes as `Object` objects except they have `toString`
    // methods that are `typeof` "string" and still can coerce nodes to strings.
    // Also check that the constructor is `Object` (i.e. `Object instanceof Object`)
    var ctor = value.constructor;
    if ((!noNodeClass || !(typeof value.toString != 'function' && typeof (value + '') == 'string')) &&
        (!isFunction(ctor) || ctor instanceof ctor)) {
      // IE < 9 iterates inherited properties before own properties. If the first
      // iterated property is an object's own property then there are no inherited
      // enumerable properties.
      if (iteratesOwnLast) {
        forIn(value, function(objValue, objKey) {
          result = !hasOwnProperty.call(value, objKey);
          return false;
        });
        return result === false;
      }
      // In most environments an object's own properties are iterated before
      // its inherited properties. If the last iterated property is an object's
      // own property then there are no inherited enumerable properties.
      forIn(value, function(objValue, objKey) {
        result = objKey;
      });
      return result === false || hasOwnProperty.call(value, result);
    }
    return result;
  }

  /**
   * Checks if a given `value` is an object created by the `Object` constructor
   * assuming objects created by the `Object` constructor have no inherited
   * enumerable properties and that there are no `Object.prototype` extensions.
   *
   * @private
   * @param {Mixed} value The value to check.
   * @param {Boolean} [skipArgsCheck=false] Internally used to skip checks for
   *  `arguments` objects.
   * @returns {Boolean} Returns `true` if the `value` is a plain `Object` object,
   *  else `false`.
   */
  var isPlainObject = objectTypes.__proto__ != ObjectProto ? isPlainFallback : function(value, skipArgsCheck) {
    if (!value) {
      return false;
    }
    var valueOf = value.valueOf,
        objProto = typeof valueOf == 'function' && valueOf.__proto__.__proto__;

    return objProto
      ? value == objProto || (value.__proto__ == objProto && (skipArgsCheck || !isArguments(value)))
      : isPlainFallback(value);
  };

  /**
   * A shim implementation of `Object.keys` that produces an array of the given
   * object's own enumerable property names.
   *
   * @private
   * @param {Object} object The object to inspect.
   * @returns {Array} Returns a new array of property names.
   */
  var shimKeys = createIterator({
    'args': 'object',
    'init': '[]',
    'inLoop': 'result.push(index)'
  });

  /*--------------------------------------------------------------------------*/

  /**
   * Creates a clone of `value`. If `deep` is `true`, all nested objects will
   * also be cloned otherwise they will be assigned by reference. If a value has
   * a `clone` method it will be used to perform the clone. Functions, DOM nodes,
   * `arguments` objects, and objects created by constructors other than `Object`
   * are **not** cloned unless they have a custom `clone` method.
   *
   * @static
   * @memberOf _
   * @category Objects
   * @param {Mixed} value The value to clone.
   * @param {Boolean} deep A flag to indicate a deep clone.
   * @param {Object} [guard] Internally used to allow this method to work with
   *  others like `_.map` without using their callback `index` argument for `deep`.
   * @param {Array} [stack=[]] Internally used to keep track of traversed objects
   *  to avoid circular references.
   * @param {Object} thorough Internally used to indicate whether or not to perform
   *  a more thorough clone of non-object values.
   * @returns {Mixed} Returns the cloned `value`.
   * @example
   *
   * var stooges = [
   *   { 'name': 'moe', 'age': 40 },
   *   { 'name': 'larry', 'age': 50 },
   *   { 'name': 'curly', 'age': 60 }
   * ];
   *
   * _.clone({ 'name': 'moe' });
   * // => { 'name': 'moe' }
   *
   * var shallow = _.clone(stooges);
   * shallow[0] === stooges[0];
   * // => true
   *
   * var deep = _.clone(stooges, true);
   * shallow[0] === stooges[0];
   * // => false
   */
  function clone(value, deep, guard, stack, thorough) {
    if (value == null) {
      return value;
    }
    if (guard) {
      deep = false;
    }
    // avoid slower checks on primitives
    thorough || (thorough = { 'value': null });
    if (thorough.value == null) {
      // primitives passed from iframes use the primary document's native prototypes
      thorough.value = !!(BoolProto.clone || NumberProto.clone || StringProto.clone);
    }
    // use custom `clone` method if available
    var isObj = objectTypes[typeof value];
    if ((isObj || thorough.value) && value.clone && isFunction(value.clone)) {
      thorough.value = null;
      return value.clone(deep);
    }
    // inspect [[Class]]
    if (isObj) {
      // don't clone `arguments` objects, functions, or non-object Objects
      var className = toString.call(value);
      if (!cloneableClasses[className] || (noArgsClass && isArguments(value))) {
        return value;
      }
      var isArr = className == arrayClass;
      isObj = isArr || (className == objectClass ? isPlainObject(value, true) : isObj);
    }
    // shallow clone
    if (!isObj || !deep) {
      // don't clone functions
      return isObj
        ? (isArr ? slice.call(value) : extend({}, value))
        : value;
    }

    var ctor = value.constructor;
    switch (className) {
      case boolClass:
        return new ctor(value == true);

      case dateClass:
        return new ctor(+value);

      case numberClass:
      case stringClass:
        return new ctor(value);

      case regexpClass:
        return ctor(value.source, reFlags.exec(value));
    }

    // check for circular references and return corresponding clone
    stack || (stack = []);
    var length = stack.length;
    while (length--) {
      if (stack[length].source == value) {
        return stack[length].value;
      }
    }

    // init cloned object
    length = value.length;
    var result = isArr ? ctor(length) : {};

    // add current clone and original source value to the stack of traversed objects
    stack.push({ 'value': result, 'source': value });

    // recursively populate clone (susceptible to call stack limits)
    if (isArr) {
      var index = -1;
      while (++index < length) {
        result[index] = clone(value[index], deep, null, stack, thorough);
      }
    } else {
      forOwn(value, function(objValue, key) {
        result[key] = clone(objValue, deep, null, stack, thorough);
      });
    }
    return result;
  }

  /**
   * Assigns enumerable properties of the default object(s) to the `destination`
   * object for all `destination` properties that resolve to `null`/`undefined`.
   * Once a property is set, additional defaults of the same property will be
   * ignored.
   *
   * @static
   * @memberOf _
   * @category Objects
   * @param {Object} object The destination object.
   * @param {Object} [default1, default2, ...] The default objects.
   * @returns {Object} Returns the destination object.
   * @example
   *
   * var iceCream = { 'flavor': 'chocolate' };
   * _.defaults(iceCream, { 'flavor': 'vanilla', 'sprinkles': 'rainbow' });
   * // => { 'flavor': 'chocolate', 'sprinkles': 'rainbow' }
   */
  var defaults = createIterator(extendIteratorOptions, {
    'inLoop': 'if (result[index] == null) ' + extendIteratorOptions.inLoop
  });

  /**
   * Assigns enumerable properties of the source object(s) to the `destination`
   * object. Subsequent sources will overwrite propery assignments of previous
   * sources.
   *
   * @static
   * @memberOf _
   * @category Objects
   * @param {Object} object The destination object.
   * @param {Object} [source1, source2, ...] The source objects.
   * @returns {Object} Returns the destination object.
   * @example
   *
   * _.extend({ 'name': 'moe' }, { 'age': 40 });
   * // => { 'name': 'moe', 'age': 40 }
   */
  var extend = createIterator(extendIteratorOptions);

  /**
   * Iterates over `object`'s own and inherited enumerable properties, executing
   * the `callback` for each property. The `callback` is bound to `thisArg` and
   * invoked with 3 arguments; (value, key, object). Callbacks may exit iteration
   * early by explicitly returning `false`.
   *
   * @static
   * @memberOf _
   * @category Objects
   * @param {Object} object The object to iterate over.
   * @param {Function} callback The function called per iteration.
   * @param {Mixed} [thisArg] The `this` binding for the callback.
   * @returns {Object} Returns `object`.
   * @example
   *
   * function Dog(name) {
   *   this.name = name;
   * }
   *
   * Dog.prototype.bark = function() {
   *   alert('Woof, woof!');
   * };
   *
   * _.forIn(new Dog('Dagny'), function(value, key) {
   *   alert(key);
   * });
   * // => alerts 'name' and 'bark' (order is not guaranteed)
   */
  var forIn = createIterator(baseIteratorOptions, forEachIteratorOptions, forOwnIteratorOptions, {
    'useHas': false
  });

  /**
   * Iterates over `object`'s own enumerable properties, executing the `callback`
   * for each property. The `callback` is bound to `thisArg` and invoked with 3
   * arguments; (value, key, object). Callbacks may exit iteration early by
   * explicitly returning `false`.
   *
   * @static
   * @memberOf _
   * @category Objects
   * @param {Object} object The object to iterate over.
   * @param {Function} callback The function called per iteration.
   * @param {Mixed} [thisArg] The `this` binding for the callback.
   * @returns {Object} Returns `object`.
   * @example
   *
   * _.forOwn({ '0': 'zero', '1': 'one', 'length': 2 }, function(num, key) {
   *   alert(key);
   * });
   * // => alerts '0', '1', and 'length' (order is not guaranteed)
   */
  var forOwn = createIterator(baseIteratorOptions, forEachIteratorOptions, forOwnIteratorOptions);

  /**
   * Creates a sorted array of all enumerable properties, own and inherited,
   * of `object` that have function values.
   *
   * @static
   * @memberOf _
   * @alias methods
   * @category Objects
   * @param {Object} object The object to inspect.
   * @returns {Array} Returns a new array of property names that have function values.
   * @example
   *
   * _.functions(_);
   * // => ['all', 'any', 'bind', 'bindAll', 'clone', 'compact', 'compose', ...]
   */
  var functions = createIterator({
    'useHas': false,
    'args': 'object',
    'init': '[]',
    'inLoop': 'if (isFunction(value)) result.push(index)',
    'bottom': 'result.sort()'
  });

  /**
   * Checks if the specified object `property` exists and is a direct property,
   * instead of an inherited property.
   *
   * @static
   * @memberOf _
   * @category Objects
   * @param {Object} object The object to check.
   * @param {String} property The property to check for.
   * @returns {Boolean} Returns `true` if key is a direct property, else `false`.
   * @example
   *
   * _.has({ 'a': 1, 'b': 2, 'c': 3 }, 'b');
   * // => true
   */
  function has(object, property) {
    return object ? hasOwnProperty.call(object, property) : false;
  }

  /**
   * Invert the keys and values of an object. The values must be serializable.
   *
   * @static
   * @memberOf _
   * @alias methods
   * @category Objects
   * @param {Object} object The object to inspect.
   * @returns {Array} Returns a new array of property names that have function values.
   * @example
   *
   *  var obj = {first: 'Moe', second: 'Larry', third: 'Curly'}
   * // => ['all', 'any', 'bind', 'bindAll', 'clone', 'compact', 'compose', ...]
   */
  var invert = createIterator({
    'args': 'object',
    'init': '{}',
    'inLoop': 'result[value] = index'
  });

  /**
   * Checks if `value` is a boolean (`true` or `false`) value.
   *
   * @static
   * @memberOf _
   * @category Objects
   * @param {Mixed} value The value to check.
   * @returns {Boolean} Returns `true` if the `value` is a boolean value, else `false`.
   * @example
   *
   * _.isBoolean(null);
   * // => false
   */
  function isBoolean(value) {
    return value === true || value === false || toString.call(value) == boolClass;
  }

  /**
   * Checks if `value` is a date.
   *
   * @static
   * @memberOf _
   * @category Objects
   * @param {Mixed} value The value to check.
   * @returns {Boolean} Returns `true` if the `value` is a date, else `false`.
   * @example
   *
   * _.isDate(new Date);
   * // => true
   */
  function isDate(value) {
    return toString.call(value) == dateClass;
  }

  /**
   * Checks if `value` is a DOM element.
   *
   * @static
   * @memberOf _
   * @category Objects
   * @param {Mixed} value The value to check.
   * @returns {Boolean} Returns `true` if the `value` is a DOM element, else `false`.
   * @example
   *
   * _.isElement(document.body);
   * // => true
   */
  function isElement(value) {
    return value ? value.nodeType === 1 : false;
  }

  /**
   * Checks if `value` is empty. Arrays, strings, or `arguments` objects with a
   * length of `0` and objects with no own enumerable properties are considered
   * "empty".
   *
   * @static
   * @memberOf _
   * @category Objects
   * @param {Array|Object|String} value The value to inspect.
   * @returns {Boolean} Returns `true` if the `value` is empty, else `false`.
   * @example
   *
   * _.isEmpty([1, 2, 3]);
   * // => false
   *
   * _.isEmpty({});
   * // => true
   *
   * _.isEmpty('');
   * // => true
   */
  var isEmpty = createIterator({
    'args': 'value',
    'init': 'true',
    'top':
      'var className = toString.call(value),\n' +
      '    length = value.length;\n' +
      'if (arrayLikeClasses[className]' +
      (noArgsClass ? ' || isArguments(value)' : '') + ' ||\n' +
      '  (className == objectClass && length > -1 && length === length >>> 0 &&\n' +
      '  isFunction(value.splice))' +
      ') return !length',
    'inLoop': {
      'object': 'return false'
    }
  });

  /**
   * Performs a deep comparison between two values to determine if they are
   * equivalent to each other. If a value has an `isEqual` method it will be
   * used to perform the comparison.
   *
   * @static
   * @memberOf _
   * @category Objects
   * @param {Mixed} a The value to compare.
   * @param {Mixed} b The other value to compare.
   * @param {Array} [stack=[]] Internally used to keep track of traversed objects
   *  to avoid circular references.
   * @param {Object} thorough Internally used to indicate whether or not to perform
   *  a more thorough comparison of non-object values.
   * @returns {Boolean} Returns `true` if the values are equvalent, else `false`.
   * @example
   *
   * var moe = { 'name': 'moe', 'luckyNumbers': [13, 27, 34] };
   * var clone = { 'name': 'moe', 'luckyNumbers': [13, 27, 34] };
   *
   * moe == clone;
   * // => false
   *
   * _.isEqual(moe, clone);
   * // => true
   */
  function isEqual(a, b, stack, thorough) {
    // a strict comparison is necessary because `null == undefined`
    if (a == null || b == null) {
      return a === b;
    }
    // avoid slower checks on non-objects
    thorough || (thorough = { 'value': null });
    if (thorough.value == null) {
      // primitives passed from iframes use the primary document's native prototypes
      thorough.value = !!(BoolProto.isEqual || NumberProto.isEqual || StringProto.isEqual);
    }
    if (objectTypes[typeof a] || objectTypes[typeof b] || thorough.value) {
      // unwrap any LoDash wrapped values
      a = a.__wrapped__ || a;
      b = b.__wrapped__ || b;

      // use custom `isEqual` method if available
      if (a.isEqual && isFunction(a.isEqual)) {
        thorough.value = null;
        return a.isEqual(b);
      }
      if (b.isEqual && isFunction(b.isEqual)) {
        thorough.value = null;
        return b.isEqual(a);
      }
    }
    // exit early for identical values
    if (a === b) {
      // treat `+0` vs. `-0` as not equal
      return a !== 0 || (1 / a == 1 / b);
    }
    // compare [[Class]] names
    var className = toString.call(a);
    if (className != toString.call(b)) {
      return false;
    }
    switch (className) {
      case boolClass:
      case dateClass:
        // coerce dates and booleans to numbers, dates to milliseconds and booleans
        // to `1` or `0`, treating invalid dates coerced to `NaN` as not equal
        return +a == +b;

      case numberClass:
        // treat `NaN` vs. `NaN` as equal
        return a != +a
          ? b != +b
          // but treat `+0` vs. `-0` as not equal
          : (a == 0 ? (1 / a == 1 / b) : a == +b);

      case regexpClass:
      case stringClass:
        // coerce regexes to strings (http://es5.github.com/#x15.10.6.4)
        // treat string primitives and their corresponding object instances as equal
        return a == b + '';
    }
    // exit early, in older browsers, if `a` is array-like but not `b`
    var isArr = arrayLikeClasses[className];
    if (noArgsClass && !isArr && (isArr = isArguments(a)) && !isArguments(b)) {
      return false;
    }
    // exit for functions and DOM nodes
    if (!isArr && (className != objectClass || (noNodeClass && (
        (typeof a.toString != 'function' && typeof (a + '') == 'string') ||
        (typeof b.toString != 'function' && typeof (b + '') == 'string'))))) {
      return false;
    }

    // assume cyclic structures are equal
    // the algorithm for detecting cyclic structures is adapted from ES 5.1
    // section 15.12.3, abstract operati…

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