diff --git a/dist/lodash.compat.js b/dist/lodash.compat.js
index 7474e70f2..222581c7d 100644
--- a/dist/lodash.compat.js
+++ b/dist/lodash.compat.js
@@ -231,6 +231,18 @@
 
   /*--------------------------------------------------------------------------*/
 
+  /**
+   * Used by `_.defaults` to customize its `_.assign` use.
+   *
+   * @private
+   * @param {*} objectValue The destination object property value.
+   * @param {*} sourceValue The source object property value.
+   * @returns {*} Returns the value to assign to the destination object.
+   */
+  function assignDefaults(objectValue, sourceValue) {
+    return typeof objectValue == 'undefined' ? sourceValue : objectValue;
+  }
+
   /**
    * The base implementation of `compareAscending` used to compare values and
    * sort them in ascending order without guaranteeing a stable sort.
@@ -1328,7 +1340,7 @@
           iterable = collection,
           length = collection ? collection.length : 0;
 
-      if (typeof length == 'number') {
+      if (typeof length == 'number' && length > -1) {
         length |= 0;
         if (support.unindexedChars && isString(iterable)) {
           iterable = iterable.split('');
@@ -1357,7 +1369,7 @@
       var iterable = collection,
           length = collection ? collection.length : 0;
 
-      if (typeof length == 'number') {
+      if (typeof length == 'number' && length > -1) {
         length = (length |= 0) < 0 ? 0 : length;
         if (support.unindexedChars && isString(iterable)) {
           iterable = iterable.split('');
@@ -2802,59 +2814,6 @@
       return array;
     }
 
-    /**
-     * Creates an array of numbers (positive and/or negative) progressing from
-     * `start` up to but not including `end`. If `start` is less than `stop` a
-     * zero-length range is created unless a negative `step` is specified.
-     *
-     * @static
-     * @memberOf _
-     * @category Arrays
-     * @param {number} [start=0] The start of the range.
-     * @param {number} end The end of the range.
-     * @param {number} [step=1] The value to increment or decrement by.
-     * @returns {Array} Returns the new array of numbers.
-     * @example
-     *
-     * _.range(4);
-     * // => [0, 1, 2, 3]
-     *
-     * _.range(1, 5);
-     * // => [1, 2, 3, 4]
-     *
-     * _.range(0, 20, 5);
-     * // => [0, 5, 10, 15]
-     *
-     * _.range(0, -4, -1);
-     * // => [0, -1, -2, -3]
-     *
-     * _.range(1, 4, 0);
-     * // => [1, 1, 1]
-     *
-     * _.range(0);
-     * // => []
-     */
-    function range(start, end, step) {
-      start = +start || 0;
-      step = typeof step == 'number' ? step : (+step || 1);
-
-      if (end == null) {
-        end = start;
-        start = 0;
-      }
-      // use `Array(length)` so engines like Chakra and V8 avoid slower modes
-      // http://youtu.be/XAqIpGU8ZZk#t=17m25s
-      var index = -1,
-          length = nativeMax(0, ceil((end - start) / (step || 1))),
-          result = Array(length);
-
-      while (++index < length) {
-        result[index] = start;
-        start += step;
-      }
-      return result;
-    }
-
     /**
      * Removes all elements from an array that the predicate returns truthy for
      * and returns an array of removed elements. The predicate is bound to `thisArg`
@@ -2954,21 +2913,19 @@
       var index = -1,
           length = array ? array.length : 0;
 
-      if (typeof start == 'undefined') {
-        start = 0;
-      } else if (start < 0) {
+      start |= 0;
+      if (start < 0) {
         start = nativeMax(length + start, 0);
       } else if (start > length) {
         start = length;
       }
-      if (typeof end == 'undefined') {
-        end = length;
-      } else if (end < 0) {
+      end = typeof end == 'undefined' ? length : (end | 0);
+      if (end < 0) {
         end = nativeMax(length + end, 0);
       } else if (end > length) {
         end = length;
       }
-      length = (length = (end - start) | 0) < 0 ? 0 : length;
+      length = start > end ? 0 : (end - start);
 
       var result = Array(length);
       while (++index < length) {
@@ -3583,20 +3540,19 @@
      */
     function contains(collection, target, fromIndex) {
       var length = collection ? collection.length : 0;
-      fromIndex = typeof fromIndex == 'number' ? fromIndex | 0 : 0;
+      fromIndex = (typeof fromIndex == 'number' && fromIndex) | 0;
 
-      if (typeof length == 'number') {
-        length = (length |= 0) < 0 ? 0 : length;
-        if (fromIndex >= length) {
-          return false;
-        }
+      if (typeof length == 'number' && length > -1) {
         if (typeof collection == 'string' || !isArray(collection) && isString(collection)) {
+          if (fromIndex >= length) {
+            return false;
+          }
           return nativeContains
             ? nativeContains.call(collection, target, fromIndex)
             : collection.indexOf(target, fromIndex) > -1;
         }
         var indexOf = getIndexOf();
-        fromIndex = fromIndex < 0 ? nativeMax(0, length + fromIndex) : fromIndex;
+        fromIndex = fromIndex < 0 ? nativeMax(0, (length | 0) + fromIndex) : fromIndex;
         return indexOf(collection, target, fromIndex) > -1;
       }
       var index = -1,
@@ -3819,27 +3775,12 @@
      * // => { 'name': 'fred', 'age': 40, 'blocked': true }
      */
     function find(collection, predicate, thisArg) {
-      predicate = lodash.createCallback(predicate, thisArg, 3);
       if (isArray(collection)) {
-        var index = -1,
-            length = collection.length;
-
-        while (++index < length) {
-          var value = collection[index];
-          if (predicate(value, index, collection)) {
-            return value;
-          }
-        }
-      } else {
-        var result;
-        baseEach(collection, function(value, index, collection) {
-          if (predicate(value, index, collection)) {
-            result = value;
-            return false;
-          }
-        });
-        return result;
+        var index = findIndex(collection, predicate, thisArg);
+        return index > -1 ? collection[index] : undefined;
       }
+      var key = findKey(collection, predicate, thisArg);
+      return typeof key == 'string' ? collection[key] : undefined;
     }
 
     /**
@@ -3863,16 +3804,12 @@
      * // => 3
      */
     function findLast(collection, predicate, thisArg) {
-      var result;
-
-      predicate = lodash.createCallback(predicate, thisArg, 3);
-      baseEachRight(collection, function(value, index, collection) {
-        if (predicate(value, index, collection)) {
-          result = value;
-          return false;
-        }
-      });
-      return result;
+      if (isArray(collection)) {
+        var index = findLastIndex(collection, predicate, thisArg);
+        return index > -1 ? collection[index] : undefined;
+      }
+      var key = findLastKey(collection, predicate, thisArg);
+      return typeof key == 'string' ? collection[key] : undefined;
     }
 
     /**
@@ -4060,7 +3997,7 @@
       var args = slice(arguments, 2),
           index = -1,
           isFunc = typeof methodName == 'function',
-          length = collection ? collection.length | 0 : 0,
+          length = (collection && collection.length) | 0,
           result = Array(length < 0 ? 0 : length);
 
       baseEach(collection, function(value) {
@@ -4110,7 +4047,7 @@
      */
     function map(collection, callback, thisArg) {
       var index = -1,
-          length = collection ? collection.length | 0 : 0,
+          length = (collection && collection.length) | 0,
           result = Array(length < 0 ? 0 : length);
 
       callback = lodash.createCallback(callback, thisArg, 3);
@@ -4499,7 +4436,7 @@
         collection = collection.split('');
       }
       if (n == null || guard) {
-        var length = collection ? collection.length | 0 : 0;
+        var length = (collection && collection.length) | 0;
         return length > 0 ? collection[baseRandom(0, length - 1)] : undefined;
       }
       var result = shuffle(collection);
@@ -4524,7 +4461,7 @@
      */
     function shuffle(collection) {
       var index = -1,
-          length = collection ? collection.length | 0 : 0,
+          length = (collection && collection.length) | 0,
           result = Array(length < 0 ? 0 : length);
 
       baseEach(collection, function(value) {
@@ -4675,8 +4612,8 @@
      */
     function sortBy(collection, callback, thisArg) {
       var index = -1,
+          length = (collection && collection.length) | 0,
           multi = callback && isArray(callback),
-          length = collection ? collection.length | 0 : 0,
           result = Array(length < 0 ? 0 : length);
 
       if (!multi) {
@@ -5674,33 +5611,10 @@
      * _.defaults({ 'name': 'barney' }, { 'name': 'fred', 'employer': 'slate' });
      * // => { 'name': 'barney', 'employer': 'slate' }
      */
-    function defaults(object, source, guard) {
-      if (!object) {
-        return object;
-      }
-      var args = arguments,
-          argsIndex = 0,
-          argsLength = args.length,
-          type = typeof guard;
-
-      // enables use as a callback for functions like `_.reduce`
-      if ((type == 'number' || type == 'string') && args[3] && args[3][guard] === source) {
-        argsLength = 2;
-      }
-      while (++argsIndex < argsLength) {
-        source = args[argsIndex];
-        var index = -1,
-            props = keys(source),
-            length = props.length;
-
-        while (++index < length) {
-          var key = props[index];
-          if (typeof object[key] == 'undefined') {
-            object[key] = source[key];
-          }
-        }
-      }
-      return object;
+    function defaults() {
+      var args = slice(arguments);
+      args.push(assignDefaults);
+      return assign.apply(null, args);
     }
 
     /**
@@ -6026,7 +5940,7 @@
      * @returns {boolean} Returns `true` if the `value` is an `arguments` object, else `false`.
      * @example
      *
-     * (function() { return _.isArguments(arguments); })(1, 2, 3);
+     * (function() { return _.isArguments(arguments); })();
      * // => true
      *
      * _.isArguments([1, 2, 3]);
@@ -6055,11 +5969,11 @@
      * @returns {boolean} Returns `true` if the `value` is an array, else `false`.
      * @example
      *
-     * (function() { return _.isArray(arguments); })();
-     * // => false
-     *
      * _.isArray([1, 2, 3]);
      * // => true
+     *
+     * (function() { return _.isArray(arguments); })();
+     * // => false
      */
     var isArray = nativeIsArray || function(value) {
       return value && typeof value == 'object' && typeof value.length == 'number' &&
@@ -6076,6 +5990,9 @@
      * @returns {boolean} Returns `true` if the `value` is a boolean value, else `false`.
      * @example
      *
+     * _.isBoolean(false);
+     * // => true
+     *
      * _.isBoolean(null);
      * // => false
      */
@@ -6096,6 +6013,9 @@
      *
      * _.isDate(new Date);
      * // => true
+     *
+     * _.isDate('Wed May 23 2012');
+     * // => false
      */
     function isDate(value) {
       return value && typeof value == 'object' && toString.call(value) == dateClass || false;
@@ -6113,6 +6033,9 @@
      *
      * _.isElement(document.body);
      * // => true
+     *
+     * _.isElement('<body>');
+     * // => false
      */
     function isElement(value) {
       return value && typeof value == 'object' && value.nodeType === 1 &&
@@ -6138,14 +6061,20 @@
      * @returns {boolean} Returns `true` if the `value` is empty, else `false`.
      * @example
      *
+     * _.isEmpty(null);
+     * // => true
+     *
+     * _.isEmpty(true);
+     * // => true
+     *
+     * _.isEmpty(1);
+     * // => true
+     *
      * _.isEmpty([1, 2, 3]);
      * // => false
      *
-     * _.isEmpty({});
-     * // => true
-     *
-     * _.isEmpty('');
-     * // => true
+     * _.isEmpty({ 'a': 1 });
+     * // => false
      */
     function isEmpty(value) {
       var result = true;
@@ -6270,6 +6199,9 @@
      *
      * _.isFunction(_);
      * // => true
+     *
+     * _.isFunction(/abc/);
+     * // => false
      */
     function isFunction(value) {
       return typeof value == 'function';
@@ -6355,7 +6287,7 @@
      * _.isNull(null);
      * // => true
      *
-     * _.isNull(undefined);
+     * _.isNull(void 0);
      * // => false
      */
     function isNull(value) {
@@ -6375,8 +6307,14 @@
      * @returns {boolean} Returns `true` if the `value` is a number, else `false`.
      * @example
      *
-     * _.isNumber(8.4 * 5);
+     * _.isNumber(8.4);
      * // => true
+     *
+     * _.isNumber(NaN);
+     * // => true
+     *
+     * _.isNumber('8.4');
+     * // => false
      */
     function isNumber(value) {
       var type = typeof value;
@@ -6430,8 +6368,11 @@
      * @returns {boolean} Returns `true` if the `value` is a regular expression, else `false`.
      * @example
      *
-     * _.isRegExp(/fred/);
+     * _.isRegExp(/abc/);
      * // => true
+     *
+     * _.isRegExp('/abc/');
+     * // => false
      */
     function isRegExp(value) {
       var type = typeof value;
@@ -6449,8 +6390,11 @@
      * @returns {boolean} Returns `true` if the `value` is a string, else `false`.
      * @example
      *
-     * _.isString('fred');
+     * _.isString('abc');
      * // => true
+     *
+     * _.isString(1);
+     * // => false
      */
     function isString(value) {
       return typeof value == 'string' ||
@@ -6469,6 +6413,9 @@
      *
      * _.isUndefined(void 0);
      * // => true
+     *
+     * _.isUndefined(null);
+     * // => false
      */
     function isUndefined(value) {
       return typeof value == 'undefined';
@@ -7998,6 +7945,61 @@
       return baseRandom(min, max);
     }
 
+    /**
+     * Creates an array of numbers (positive and/or negative) progressing from
+     * `start` up to but not including `end`. If `start` is less than `stop` a
+     * zero-length range is created unless a negative `step` is specified.
+     *
+     * @static
+     * @memberOf _
+     * @category Utilities
+     * @param {number} [start=0] The start of the range.
+     * @param {number} end The end of the range.
+     * @param {number} [step=1] The value to increment or decrement by.
+     * @returns {Array} Returns the new array of numbers.
+     * @example
+     *
+     * _.range(4);
+     * // => [0, 1, 2, 3]
+     *
+     * _.range(1, 5);
+     * // => [1, 2, 3, 4]
+     *
+     * _.range(0, 20, 5);
+     * // => [0, 5, 10, 15]
+     *
+     * _.range(0, -4, -1);
+     * // => [0, -1, -2, -3]
+     *
+     * _.range(1, 4, 0);
+     * // => [1, 1, 1]
+     *
+     * _.range(0);
+     * // => []
+     */
+    function range(start, end, step) {
+      start = +start || 0;
+      step = step == null ? 1 : (+step || 0);
+
+      if (end == null) {
+        end = start;
+        start = 0;
+      } else {
+        end = +end || 0;
+      }
+      // use `Array(length)` so engines like Chakra and V8 avoid slower modes
+      // http://youtu.be/XAqIpGU8ZZk#t=17m25s
+      var index = -1,
+          length = nativeMax(0, ceil((end - start) / (step || 1))),
+          result = Array(length);
+
+      while (++index < length) {
+        result[index] = start;
+        start += step;
+      }
+      return result;
+    }
+
     /**
      * Resolves the value of property `key` on `object`. If `key` is a function
      * it will be invoked with the `this` binding of `object` and its result
diff --git a/dist/lodash.compat.min.js b/dist/lodash.compat.min.js
index 961dd5c52..9c5085cb4 100644
--- a/dist/lodash.compat.min.js
+++ b/dist/lodash.compat.min.js
@@ -3,67 +3,66 @@
  * Lo-Dash 2.4.1 (Custom Build) lodash.com/license | Underscore.js 1.6.0 underscorejs.org/LICENSE
  * Build: `lodash -o ./dist/lodash.compat.js`
  */
-;(function(){function n(n,t){if(n!==t){if(n>t||typeof n=="undefined")return 1;if(n<t||typeof t=="undefined")return-1}return 0}function t(n,t,r){r=(0|r)-1;for(var e=n?n.length:0;++r<e;)if(n[r]===t)return r;return-1}function r(n,t){return n.has(t)?0:-1}function e(n){return n.charCodeAt(0)}function u(n,t){for(var r=-1,e=n.length;++r<e&&0<=t.indexOf(n.charAt(r)););return r}function o(n,t){for(var r=n.length;r--&&0<=t.indexOf(n.charAt(r)););return r}function a(t,r){return n(t.a,r.a)||t.b-r.b}function i(t,r){for(var e=t.a,u=r.a,o=-1,a=e.length;++o<a;){var i=n(e[o],u[o]);
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-}function v(n,t){return(n=null==n?"":n+"")?null==t?n.slice(0,m(n)+1):(t+="",n.slice(0,o(n,t)+1)):n}function y(n){for(var t=-1,r=n.length;++t<r;){var e=n.charCodeAt(t);if((160<e||9>e||13<e)&&32!=e&&160!=e&&5760!=e&&6158!=e&&(8192>e||8202<e&&8232!=e&&8233!=e&&8239!=e&&8287!=e&&12288!=e&&65279!=e))break}return t}function m(n){for(var t=n.length;t--;){var r=n.charCodeAt(t);if((160<r||9>r||13<r)&&32!=r&&160!=r&&5760!=r&&6158!=r&&(8192>r||8202<r&&8232!=r&&8233!=r&&8239!=r&&8287!=r&&12288!=r&&65279!=r))break
-}return t}function d(n){return st[n]}function b(n){function u(n){return n&&typeof n=="object"&&!Ee(n)&&Yr.call(n,"__wrapped__")?n:new o(n)}function o(n,t){this.__chain__=!!t,this.__wrapped__=n}function f(n){function t(){if(u){for(var n=-1,a=arguments.length,i=kr(a);++n<a;)i[n]=arguments[n];i=jt(u,o,i)}return this instanceof t?(n=m(r.prototype),i=r.apply(n,i||arguments),cr(i)?i:n):r.apply(e,i||arguments)}var r=n[0],e=n[3],u=n[4],o=n[6];return we(t,n),t}function y(n,t,r,e,u){if(r){var o=r(n);if(typeof o!="undefined")return o
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+lt[et]=false,lt[J]=lt[Q]=lt[nt]=lt[tt]=lt[ut]=lt[ot]=lt[at]=lt[it]=true;var ft={leading:false,maxWait:0,trailing:false},ct={configurable:false,enumerable:false,value:null,writable:false},st={"&":"&amp;","<":"&lt;",">":"&gt;",'"':"&quot;","'":"&#39;"},pt={"&amp;":"&","&lt;":"<","&gt;":">","&quot;":'"',"&#39;":"'"},ht={\u00c0:"A",\u00c1:"A",\u00c2:"A",\u00c3:"A",\u00c4:"A",\u00c5:"A",\u00e0:"a",\u00e1:"a",\u00e2:"a",\u00e3:"a",\u00e4:"a",\u00e5:"a",\u00c7:"C",\u00e7:"c",\u00d0:"D",\u00f0:"d",\u00c8:"E",\u00c9:"E",\u00ca:"E",\u00cb:"E",\u00e8:"e",\u00e9:"e",\u00ea:"e",\u00eb:"e",\u00cc:"I",\u00cd:"I",\u00ce:"I",\u00cf:"I",\u00ec:"i",\u00ed:"i",\u00ee:"i",\u00ef:"i",\u00d1:"N",\u00f1:"n",\u00d2:"O",\u00d3:"O",\u00d4:"O",\u00d5:"O",\u00d6:"O",\u00d8:"O",\u00f2:"o",\u00f3:"o",\u00f4:"o",\u00f5:"o",\u00f6:"o",\u00f8:"o",\u00d9:"U",\u00da:"U",\u00db:"U",\u00dc:"U",\u00f9:"u",\u00fa:"u",\u00fb:"u",\u00fc:"u",\u00dd:"Y",\u00fd:"y",\u00ff:"y",\u00c6:"AE",\u00e6:"ae",\u00de:"Th",\u00fe:"th",\u00df:"ss","\xd7":" ","\xf7":" "},gt={"function":true,object:true},vt={"\\":"\\","'":"'","\n":"n","\r":"r","\t":"t","\u2028":"u2028","\u2029":"u2029"},yt=gt[typeof window]&&window||this,mt=gt[typeof exports]&&exports&&!exports.nodeType&&exports,gt=gt[typeof module]&&module&&!module.nodeType&&module,dt=mt&&gt&&typeof global=="object"&&global;
+!dt||dt.global!==dt&&dt.window!==dt&&dt.self!==dt||(yt=dt);var dt=gt&&gt.exports===mt&&mt,bt=_();typeof define=="function"&&typeof define.amd=="object"&&define.amd?(yt._=bt, define(function(){return bt})):mt&&gt?dt?(gt.exports=bt)._=bt:mt._=bt:yt._=bt}).call(this);
\ No newline at end of file
diff --git a/dist/lodash.js b/dist/lodash.js
index 34ccba2e1..675e5bcde 100644
--- a/dist/lodash.js
+++ b/dist/lodash.js
@@ -224,6 +224,18 @@
 
   /*--------------------------------------------------------------------------*/
 
+  /**
+   * Used by `_.defaults` to customize its `_.assign` use.
+   *
+   * @private
+   * @param {*} objectValue The destination object property value.
+   * @param {*} sourceValue The source object property value.
+   * @returns {*} Returns the value to assign to the destination object.
+   */
+  function assignDefaults(objectValue, sourceValue) {
+    return typeof objectValue == 'undefined' ? sourceValue : objectValue;
+  }
+
   /**
    * The base implementation of `compareAscending` used to compare values and
    * sort them in ascending order without guaranteeing a stable sort.
@@ -1171,7 +1183,7 @@
           iterable = collection,
           length = collection ? collection.length : 0;
 
-      if (typeof length == 'number') {
+      if (typeof length == 'number' && length > -1) {
         length |= 0;
         while (++index < length) {
           if (callback(iterable[index], index, collection) === false) {
@@ -1197,7 +1209,7 @@
       var iterable = collection,
           length = collection ? collection.length : 0;
 
-      if (typeof length == 'number') {
+      if (typeof length == 'number' && length > -1) {
         length = (length |= 0) < 0 ? 0 : length;
         while (length--) {
           if (callback(iterable[length], length, collection) === false) {
@@ -1745,7 +1757,7 @@
         callback = lodash.createCallback(callback, thisArg, 3);
 
         var index = -1,
-            length = collection ? collection.length | 0 : 0;
+            length = (collection && collection.length) | 0;
 
         if (length > 0) {
           while (++index < length) {
@@ -2627,59 +2639,6 @@
       return array;
     }
 
-    /**
-     * Creates an array of numbers (positive and/or negative) progressing from
-     * `start` up to but not including `end`. If `start` is less than `stop` a
-     * zero-length range is created unless a negative `step` is specified.
-     *
-     * @static
-     * @memberOf _
-     * @category Arrays
-     * @param {number} [start=0] The start of the range.
-     * @param {number} end The end of the range.
-     * @param {number} [step=1] The value to increment or decrement by.
-     * @returns {Array} Returns the new array of numbers.
-     * @example
-     *
-     * _.range(4);
-     * // => [0, 1, 2, 3]
-     *
-     * _.range(1, 5);
-     * // => [1, 2, 3, 4]
-     *
-     * _.range(0, 20, 5);
-     * // => [0, 5, 10, 15]
-     *
-     * _.range(0, -4, -1);
-     * // => [0, -1, -2, -3]
-     *
-     * _.range(1, 4, 0);
-     * // => [1, 1, 1]
-     *
-     * _.range(0);
-     * // => []
-     */
-    function range(start, end, step) {
-      start = +start || 0;
-      step = typeof step == 'number' ? step : (+step || 1);
-
-      if (end == null) {
-        end = start;
-        start = 0;
-      }
-      // use `Array(length)` so engines like Chakra and V8 avoid slower modes
-      // http://youtu.be/XAqIpGU8ZZk#t=17m25s
-      var index = -1,
-          length = nativeMax(0, ceil((end - start) / (step || 1))),
-          result = Array(length);
-
-      while (++index < length) {
-        result[index] = start;
-        start += step;
-      }
-      return result;
-    }
-
     /**
      * Removes all elements from an array that the predicate returns truthy for
      * and returns an array of removed elements. The predicate is bound to `thisArg`
@@ -2779,21 +2738,19 @@
       var index = -1,
           length = array ? array.length : 0;
 
-      if (typeof start == 'undefined') {
-        start = 0;
-      } else if (start < 0) {
+      start |= 0;
+      if (start < 0) {
         start = nativeMax(length + start, 0);
       } else if (start > length) {
         start = length;
       }
-      if (typeof end == 'undefined') {
-        end = length;
-      } else if (end < 0) {
+      end = typeof end == 'undefined' ? length : (end | 0);
+      if (end < 0) {
         end = nativeMax(length + end, 0);
       } else if (end > length) {
         end = length;
       }
-      length = (length = (end - start) | 0) < 0 ? 0 : length;
+      length = start > end ? 0 : (end - start);
 
       var result = Array(length);
       while (++index < length) {
@@ -3405,20 +3362,19 @@
      */
     function contains(collection, target, fromIndex) {
       var length = collection ? collection.length : 0;
-      fromIndex = typeof fromIndex == 'number' ? fromIndex | 0 : 0;
+      fromIndex = (typeof fromIndex == 'number' && fromIndex) | 0;
 
-      if (typeof length == 'number') {
-        length = (length |= 0) < 0 ? 0 : length;
-        if (fromIndex >= length) {
-          return false;
-        }
+      if (typeof length == 'number' && length > -1) {
         if (typeof collection == 'string' || !isArray(collection) && isString(collection)) {
+          if (fromIndex >= length) {
+            return false;
+          }
           return nativeContains
             ? nativeContains.call(collection, target, fromIndex)
             : collection.indexOf(target, fromIndex) > -1;
         }
         var indexOf = getIndexOf();
-        fromIndex = fromIndex < 0 ? nativeMax(0, length + fromIndex) : fromIndex;
+        fromIndex = fromIndex < 0 ? nativeMax(0, (length | 0) + fromIndex) : fromIndex;
         return indexOf(collection, target, fromIndex) > -1;
       }
       var index = -1,
@@ -3517,7 +3473,7 @@
 
       predicate = lodash.createCallback(predicate, thisArg, 3);
       var index = -1,
-          length = collection ? collection.length | 0 : 0;
+          length = (collection && collection.length) | 0;
 
       if (length > 0) {
         while (++index < length) {
@@ -3578,7 +3534,7 @@
 
       predicate = lodash.createCallback(predicate, thisArg, 3);
       var index = -1,
-          length = collection ? collection.length | 0 : 0;
+          length = (collection && collection.length) | 0;
 
       if (length > 0) {
         while (++index < length) {
@@ -3641,27 +3597,13 @@
      * // => { 'name': 'fred', 'age': 40, 'blocked': true }
      */
     function find(collection, predicate, thisArg) {
-      predicate = lodash.createCallback(predicate, thisArg, 3);
-      var index = -1,
-          length = collection ? collection.length | 0 : 0;
-
+      var length = (collection && collection.length) | 0;
       if (length > 0) {
-        while (++index < length) {
-          var value = collection[index];
-          if (predicate(value, index, collection)) {
-            return value;
-          }
-        }
-      } else {
-        var result;
-        baseEach(collection, function(value, index, collection) {
-          if (predicate(value, index, collection)) {
-            result = value;
-            return false;
-          }
-        });
-        return result;
+        var index = findIndex(collection, predicate, thisArg);
+        return index > -1 ? collection[index] : undefined;
       }
+      var key = findKey(collection, predicate, thisArg);
+      return typeof key == 'string' ? collection[key] : undefined;
     }
 
     /**
@@ -3685,16 +3627,13 @@
      * // => 3
      */
     function findLast(collection, predicate, thisArg) {
-      var result;
-
-      predicate = lodash.createCallback(predicate, thisArg, 3);
-      baseEachRight(collection, function(value, index, collection) {
-        if (predicate(value, index, collection)) {
-          result = value;
-          return false;
-        }
-      });
-      return result;
+      var length = (collection && collection.length) | 0;
+      if (length > 0) {
+        var index = findLastIndex(collection, predicate, thisArg);
+        return index > -1 ? collection[index] : undefined;
+      }
+      var key = findLastKey(collection, predicate, thisArg);
+      return typeof key == 'string' ? collection[key] : undefined;
     }
 
     /**
@@ -3725,7 +3664,7 @@
      */
     function forEach(collection, callback, thisArg) {
       var index = -1,
-          length = collection ? collection.length | 0 : 0;
+          length = (collection && collection.length) | 0;
 
       callback = callback && typeof thisArg == 'undefined' ? callback : baseCreateCallback(callback, thisArg, 3);
       if (length > 0) {
@@ -3758,7 +3697,7 @@
      * // => logs each number from right to left and returns '3,2,1'
      */
     function forEachRight(collection, callback, thisArg) {
-      var length = collection ? collection.length | 0 : 0;
+      var length = (collection && collection.length) | 0;
 
       callback = callback && typeof thisArg == 'undefined' ? callback : baseCreateCallback(callback, thisArg, 3);
       if (length > 0) {
@@ -3885,7 +3824,7 @@
       var args = slice(arguments, 2),
           index = -1,
           isFunc = typeof methodName == 'function',
-          length = collection ? collection.length | 0 : 0,
+          length = (collection && collection.length) | 0,
           result = Array(length < 0 ? 0 : length);
 
       baseEach(collection, function(value) {
@@ -3935,7 +3874,7 @@
      */
     function map(collection, callback, thisArg) {
       var index = -1,
-          length = collection ? collection.length | 0 : 0;
+          length = (collection && collection.length) | 0;
 
       callback = lodash.createCallback(callback, thisArg, 3);
       if (length > 0) {
@@ -4207,7 +4146,7 @@
       callback = lodash.createCallback(callback, thisArg, 4);
 
       var index = -1,
-          length = collection ? collection.length | 0 : 0;
+          length = (collection && collection.length) | 0;
 
       if (length > 0) {
         if (noaccum && length) {
@@ -4323,7 +4262,7 @@
         collection = values(collection);
       }
       if (n == null || guard) {
-        var length = collection ? collection.length | 0 : 0;
+        var length = (collection && collection.length) | 0;
         return length > 0 ? collection[baseRandom(0, length - 1)] : undefined;
       }
       var result = shuffle(collection);
@@ -4348,7 +4287,7 @@
      */
     function shuffle(collection) {
       var index = -1,
-          length = collection ? collection.length | 0 : 0,
+          length = (collection && collection.length) | 0,
           result = Array(length < 0 ? 0 : length);
 
       baseEach(collection, function(value) {
@@ -4432,7 +4371,7 @@
 
       predicate = lodash.createCallback(predicate, thisArg, 3);
       var index = -1,
-          length = collection ? collection.length | 0 : 0;
+          length = (collection && collection.length) | 0;
 
       if (length > 0) {
         while (++index < length) {
@@ -4499,8 +4438,8 @@
      */
     function sortBy(collection, callback, thisArg) {
       var index = -1,
+          length = (collection && collection.length) | 0,
           multi = callback && isArray(callback),
-          length = collection ? collection.length | 0 : 0,
           result = Array(length < 0 ? 0 : length);
 
       if (!multi) {
@@ -5496,33 +5435,10 @@
      * _.defaults({ 'name': 'barney' }, { 'name': 'fred', 'employer': 'slate' });
      * // => { 'name': 'barney', 'employer': 'slate' }
      */
-    function defaults(object, source, guard) {
-      if (!object) {
-        return object;
-      }
-      var args = arguments,
-          argsIndex = 0,
-          argsLength = args.length,
-          type = typeof guard;
-
-      // enables use as a callback for functions like `_.reduce`
-      if ((type == 'number' || type == 'string') && args[3] && args[3][guard] === source) {
-        argsLength = 2;
-      }
-      while (++argsIndex < argsLength) {
-        source = args[argsIndex];
-        var index = -1,
-            props = keys(source),
-            length = props.length;
-
-        while (++index < length) {
-          var key = props[index];
-          if (typeof object[key] == 'undefined') {
-            object[key] = source[key];
-          }
-        }
-      }
-      return object;
+    function defaults() {
+      var args = slice(arguments);
+      args.push(assignDefaults);
+      return assign.apply(null, args);
     }
 
     /**
@@ -5848,7 +5764,7 @@
      * @returns {boolean} Returns `true` if the `value` is an `arguments` object, else `false`.
      * @example
      *
-     * (function() { return _.isArguments(arguments); })(1, 2, 3);
+     * (function() { return _.isArguments(arguments); })();
      * // => true
      *
      * _.isArguments([1, 2, 3]);
@@ -5870,11 +5786,11 @@
      * @returns {boolean} Returns `true` if the `value` is an array, else `false`.
      * @example
      *
-     * (function() { return _.isArray(arguments); })();
-     * // => false
-     *
      * _.isArray([1, 2, 3]);
      * // => true
+     *
+     * (function() { return _.isArray(arguments); })();
+     * // => false
      */
     var isArray = nativeIsArray || function(value) {
       return value && typeof value == 'object' && typeof value.length == 'number' &&
@@ -5891,6 +5807,9 @@
      * @returns {boolean} Returns `true` if the `value` is a boolean value, else `false`.
      * @example
      *
+     * _.isBoolean(false);
+     * // => true
+     *
      * _.isBoolean(null);
      * // => false
      */
@@ -5911,6 +5830,9 @@
      *
      * _.isDate(new Date);
      * // => true
+     *
+     * _.isDate('Wed May 23 2012');
+     * // => false
      */
     function isDate(value) {
       return value && typeof value == 'object' && toString.call(value) == dateClass || false;
@@ -5928,6 +5850,9 @@
      *
      * _.isElement(document.body);
      * // => true
+     *
+     * _.isElement('<body>');
+     * // => false
      */
     function isElement(value) {
       return value && typeof value == 'object' && value.nodeType === 1 &&
@@ -5953,14 +5878,20 @@
      * @returns {boolean} Returns `true` if the `value` is empty, else `false`.
      * @example
      *
+     * _.isEmpty(null);
+     * // => true
+     *
+     * _.isEmpty(true);
+     * // => true
+     *
+     * _.isEmpty(1);
+     * // => true
+     *
      * _.isEmpty([1, 2, 3]);
      * // => false
      *
-     * _.isEmpty({});
-     * // => true
-     *
-     * _.isEmpty('');
-     * // => true
+     * _.isEmpty({ 'a': 1 });
+     * // => false
      */
     function isEmpty(value) {
       var result = true;
@@ -6084,6 +6015,9 @@
      *
      * _.isFunction(_);
      * // => true
+     *
+     * _.isFunction(/abc/);
+     * // => false
      */
     function isFunction(value) {
       return typeof value == 'function';
@@ -6163,7 +6097,7 @@
      * _.isNull(null);
      * // => true
      *
-     * _.isNull(undefined);
+     * _.isNull(void 0);
      * // => false
      */
     function isNull(value) {
@@ -6183,8 +6117,14 @@
      * @returns {boolean} Returns `true` if the `value` is a number, else `false`.
      * @example
      *
-     * _.isNumber(8.4 * 5);
+     * _.isNumber(8.4);
      * // => true
+     *
+     * _.isNumber(NaN);
+     * // => true
+     *
+     * _.isNumber('8.4');
+     * // => false
      */
     function isNumber(value) {
       var type = typeof value;
@@ -6238,8 +6178,11 @@
      * @returns {boolean} Returns `true` if the `value` is a regular expression, else `false`.
      * @example
      *
-     * _.isRegExp(/fred/);
+     * _.isRegExp(/abc/);
      * // => true
+     *
+     * _.isRegExp('/abc/');
+     * // => false
      */
     function isRegExp(value) {
       return value && typeof value == 'object' && toString.call(value) == regexpClass || false;
@@ -6255,8 +6198,11 @@
      * @returns {boolean} Returns `true` if the `value` is a string, else `false`.
      * @example
      *
-     * _.isString('fred');
+     * _.isString('abc');
      * // => true
+     *
+     * _.isString(1);
+     * // => false
      */
     function isString(value) {
       return typeof value == 'string' ||
@@ -6275,6 +6221,9 @@
      *
      * _.isUndefined(void 0);
      * // => true
+     *
+     * _.isUndefined(null);
+     * // => false
      */
     function isUndefined(value) {
       return typeof value == 'undefined';
@@ -7771,6 +7720,61 @@
       return baseRandom(min, max);
     }
 
+    /**
+     * Creates an array of numbers (positive and/or negative) progressing from
+     * `start` up to but not including `end`. If `start` is less than `stop` a
+     * zero-length range is created unless a negative `step` is specified.
+     *
+     * @static
+     * @memberOf _
+     * @category Utilities
+     * @param {number} [start=0] The start of the range.
+     * @param {number} end The end of the range.
+     * @param {number} [step=1] The value to increment or decrement by.
+     * @returns {Array} Returns the new array of numbers.
+     * @example
+     *
+     * _.range(4);
+     * // => [0, 1, 2, 3]
+     *
+     * _.range(1, 5);
+     * // => [1, 2, 3, 4]
+     *
+     * _.range(0, 20, 5);
+     * // => [0, 5, 10, 15]
+     *
+     * _.range(0, -4, -1);
+     * // => [0, -1, -2, -3]
+     *
+     * _.range(1, 4, 0);
+     * // => [1, 1, 1]
+     *
+     * _.range(0);
+     * // => []
+     */
+    function range(start, end, step) {
+      start = +start || 0;
+      step = step == null ? 1 : (+step || 0);
+
+      if (end == null) {
+        end = start;
+        start = 0;
+      } else {
+        end = +end || 0;
+      }
+      // use `Array(length)` so engines like Chakra and V8 avoid slower modes
+      // http://youtu.be/XAqIpGU8ZZk#t=17m25s
+      var index = -1,
+          length = nativeMax(0, ceil((end - start) / (step || 1))),
+          result = Array(length);
+
+      while (++index < length) {
+        result[index] = start;
+        start += step;
+      }
+      return result;
+    }
+
     /**
      * Resolves the value of property `key` on `object`. If `key` is a function
      * it will be invoked with the `this` binding of `object` and its result
diff --git a/dist/lodash.min.js b/dist/lodash.min.js
index 6b73200de..eb5128a93 100644
--- a/dist/lodash.min.js
+++ b/dist/lodash.min.js
@@ -3,62 +3,62 @@
  * Lo-Dash 2.4.1 (Custom Build) lodash.com/license | Underscore.js 1.6.0 underscorejs.org/LICENSE
  * Build: `lodash modern -o ./dist/lodash.js`
  */
-;(function(){function n(n,t){if(n!==t){if(n>t||typeof n=="undefined")return 1;if(n<t||typeof t=="undefined")return-1}return 0}function t(n,t,r){r=(0|r)-1;for(var e=n?n.length:0;++r<e;)if(n[r]===t)return r;return-1}function r(n,t){return n.has(t)?0:-1}function e(n){return n.charCodeAt(0)}function u(n,t){for(var r=-1,e=n.length;++r<e&&0<=t.indexOf(n.charAt(r)););return r}function o(n,t){for(var r=n.length;r--&&0<=t.indexOf(n.charAt(r)););return r}function i(t,r){return n(t.a,r.a)||t.b-r.b}function a(t,r){for(var e=t.a,u=r.a,o=-1,i=e.length;++o<i;){var a=n(e[o],u[o]);
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-}function v(n){for(var t=-1,r=n.length;++t<r;){var e=n.charCodeAt(t);if((160<e||9>e||13<e)&&32!=e&&160!=e&&5760!=e&&6158!=e&&(8192>e||8202<e&&8232!=e&&8233!=e&&8239!=e&&8287!=e&&12288!=e&&65279!=e))break}return t}function y(n){for(var t=n.length;t--;){var r=n.charCodeAt(t);if((160<r||9>r||13<r)&&32!=r&&160!=r&&5760!=r&&6158!=r&&(8192>r||8202<r&&8232!=r&&8233!=r&&8239!=r&&8287!=r&&12288!=r&&65279!=r))break}return t}function m(n){return ft[n]}function d(n){function u(n){return n&&typeof n=="object"&&!we(n)&&Kr.call(n,"__wrapped__")?n:new o(n)
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+n.replace(f,function(t,r,e,o,a,f){return e||(e=o),c+=n.slice(l,f).replace(V,s),r&&(u=true,c+="'+__e("+r+")+'"),a&&(i=true,c+="';"+a+";\n__p+='"),e&&(c+="'+((__t=("+e+"))==null?'':__t)+'"),l=f+t.length,t}),c+="';",(r=r.variable)||(c="with(obj){"+c+"}"),c=(i?c.replace(R,""):c).replace(N,"$1").replace(S,"$1;"),c="function("+(r||"obj")+"){"+(r?"":"obj||(obj={});")+"var __t,__p=''"+(u?",__e=_.escape":"")+(i?",__j=Array.prototype.join;function print(){__p+=__j.call(arguments,'')}":";")+c+"return __p}";try{var p=Rr(e,"return "+c).apply(_,a)
+}catch(h){throw h.source=c,h}return t?p(t):(p.source=c,p)},o.trim=Se,o.trimLeft=Te,o.trimRight=We,o.truncate=function(n,t){var r=30,e="...";if(t&&sr(t))var u="separator"in t?t.separator:u,r="length"in t?0|t.length:r,e="omission"in t?Fr(t.omission):e;else null!=t&&(r=0|t);if(n=null==n?"":Fr(n),r>=n.length)return n;var o=r-e.length;if(1>o)return e;if(r=n.slice(0,o),null==u)return r+e;if(gr(u)){if(n.slice(o).search(u)){var i,a,l=n.slice(0,o);for(u.global||(u=Wr(u.source,(z.exec(u)||"")+"g")),u.lastIndex=0;i=u.exec(l);)a=i.index;
+r=r.slice(0,null==a?o:a)}}else n.indexOf(u,o)!=o&&(u=r.lastIndexOf(u),-1<u&&(r=r.slice(0,u)));return r+e},o.unescape=function(n){return null==n?"":(n=Fr(n),0>n.indexOf(";")?n:n.replace(T,d))},o.uniqueId=function(n){var t=++E;return Fr(null==n?"":n)+t},o.all=Kt,o.any=nr,o.detect=Vt,o.findWhere=Vt,o.foldl=Ht,o.foldr=Jt,o.include=Pt,o.inject=Ht,kr(function(){var n={};return vt(o,function(t,r){o.prototype[r]||(n[r]=t)}),n}(),false),o.first=St,o.last=Ft,o.sample=function(n,t,r){return n&&typeof n.length!="number"&&(n=dr(n)),null==t||r?(t=0|(n&&n.length),0<t?n[bt(0,t-1)]:_):(n=Qt(n),n.length=fe(le(0,t),n.length),n)
+},o.take=St,o.takeRight=Ft,o.takeRightWhile=Ft,o.takeWhile=St,o.head=St,vt(o,function(n,t){var r="sample"!==t;o.prototype[t]||(o.prototype[t]=function(t,e){var u=this.__chain__,o=n(this.__wrapped__,t,e);return u||null!=t&&(!e||r&&typeof t=="function")?new i(o,u):o})}),o.VERSION=A,o.prototype.chain=function(){return this.__chain__=true,this},o.prototype.toString=function(){return Fr(this.__wrapped__)},o.prototype.value=Ut,o.prototype.valueOf=Ut,ft(["join","pop","shift"],function(n){var t=Dr[n];o.prototype[n]=function(){var n=this.__chain__,r=t.apply(this.__wrapped__,arguments);
+return n?new i(r,n):r}}),ft(["push","reverse","sort","unshift"],function(n){var t=Dr[n];o.prototype[n]=function(){return t.apply(this.__wrapped__,arguments),this}}),ft(["concat","splice"],function(n){var t=Dr[n];o.prototype[n]=function(){return new i(t.apply(this.__wrapped__,arguments),this.__chain__)}}),o}var _,w=1,x=2,j=4,k=8,C=16,O=32,A="2.4.1",I="__lodash@"+A+"__",E=0,R=/\b__p\+='';/g,N=/\b(__p\+=)''\+/g,S=/(__e\(.*?\)|\b__t\))\+'';/g,T=/&(?:amp|lt|gt|quot|#39);/g,W=/[&<>"']/g,F=/<%-([\s\S]+?)%>/g,$=/<%([\s\S]+?)%>/g,D=/<%=([\s\S]+?)%>/g,L=/\$\{([^\\}]*(?:\\.[^\\}]*)*)\}/g,z=/\w*$/,B=/^\s*function[ \n\r\t]+\w/,q=/^0[xX]/,U=/[\xC0-\xFF]/g,P=/($^)/,K=/[.*+?^${}()|[\]\\]/g,M=/\bthis\b/,V=/['\n\r\t\u2028\u2029\\]/g,Z=/[A-Z]{2,}|[a-zA-Z0-9][a-z0-9]*/g,X=" \t\x0B\f\xa0\ufeff\n\r\u2028\u2029\u1680\u180e\u2000\u2001\u2002\u2003\u2004\u2005\u2006\u2007\u2008\u2009\u200a\u202f\u205f\u3000",Y="Array Boolean Date Function Math Number Object RegExp Set String _ clearTimeout document isFinite isNaN parseInt setTimeout TypeError window WinRTError".split(" "),G="[object Arguments]",H="[object Array]",J="[object Boolean]",Q="[object Date]",nt="[object Function]",tt="[object Number]",rt="[object Object]",et="[object RegExp]",ut="[object String]",ot={};
+ot[nt]=false,ot[G]=ot[H]=ot[J]=ot[Q]=ot[tt]=ot[rt]=ot[et]=ot[ut]=true;var it={leading:false,maxWait:0,trailing:false},at={configurable:false,enumerable:false,value:null,writable:false},lt={"&":"&amp;","<":"&lt;",">":"&gt;",'"':"&quot;","'":"&#39;"},ft={"&amp;":"&","&lt;":"<","&gt;":">","&quot;":'"',"&#39;":"'"},ct={\u00c0:"A",\u00c1:"A",\u00c2:"A",\u00c3:"A",\u00c4:"A",\u00c5:"A",\u00e0:"a",\u00e1:"a",\u00e2:"a",\u00e3:"a",\u00e4:"a",\u00e5:"a",\u00c7:"C",\u00e7:"c",\u00d0:"D",\u00f0:"d",\u00c8:"E",\u00c9:"E",\u00ca:"E",\u00cb:"E",\u00e8:"e",\u00e9:"e",\u00ea:"e",\u00eb:"e",\u00cc:"I",\u00cd:"I",\u00ce:"I",\u00cf:"I",\u00ec:"i",\u00ed:"i",\u00ee:"i",\u00ef:"i",\u00d1:"N",\u00f1:"n",\u00d2:"O",\u00d3:"O",\u00d4:"O",\u00d5:"O",\u00d6:"O",\u00d8:"O",\u00f2:"o",\u00f3:"o",\u00f4:"o",\u00f5:"o",\u00f6:"o",\u00f8:"o",\u00d9:"U",\u00da:"U",\u00db:"U",\u00dc:"U",\u00f9:"u",\u00fa:"u",\u00fb:"u",\u00fc:"u",\u00dd:"Y",\u00fd:"y",\u00ff:"y",\u00c6:"AE",\u00e6:"ae",\u00de:"Th",\u00fe:"th",\u00df:"ss","\xd7":" ","\xf7":" "},pt={"function":true,object:true},st={"\\":"\\","'":"'","\n":"n","\r":"r","\t":"t","\u2028":"u2028","\u2029":"u2029"},ht=pt[typeof window]&&window||this,gt=pt[typeof exports]&&exports&&!exports.nodeType&&exports,pt=pt[typeof module]&&module&&!module.nodeType&&module,vt=gt&&pt&&typeof global=="object"&&global;
+!vt||vt.global!==vt&&vt.window!==vt&&vt.self!==vt||(ht=vt);var vt=pt&&pt.exports===gt&&gt,yt=b();typeof define=="function"&&typeof define.amd=="object"&&define.amd?(ht._=yt, define(function(){return yt})):gt&&pt?vt?(pt.exports=yt)._=yt:gt._=yt:ht._=yt}).call(this);
\ No newline at end of file
diff --git a/dist/lodash.underscore.js b/dist/lodash.underscore.js
index edb0830ee..1f787bc98 100644
--- a/dist/lodash.underscore.js
+++ b/dist/lodash.underscore.js
@@ -566,7 +566,7 @@
         iterable = collection,
         length = collection ? collection.length : 0;
 
-    if (typeof length == 'number') {
+    if (typeof length == 'number' && length > -1) {
       length |= 0;
       while (++index < length) {
         if (callback(iterable[index], index, collection) === breakIndicator) {
@@ -592,7 +592,7 @@
     var iterable = collection,
         length = collection ? collection.length : 0;
 
-    if (typeof length == 'number') {
+    if (typeof length == 'number' && length > -1) {
       length = (length |= 0) < 0 ? 0 : length;
       while (length--) {
         if (callback(iterable[length], length, collection) === breakIndicator) {
@@ -978,7 +978,7 @@
       callback = createCallback(callback, thisArg, 3);
 
       var index = -1,
-          length = collection ? collection.length | 0 : 0;
+          length = (collection && collection.length) | 0;
 
       if (length > 0) {
         while (++index < length) {
@@ -1185,6 +1185,60 @@
    */
   var drop = rest;
 
+  /**
+   * This method is like `_.find` except that it returns the index of the first
+   * element the predicate returns truthy for, instead of the element itself.
+   *
+   * If a property name is provided for `predicate` the created "_.pluck" style
+   * callback will return the property value of the given element.
+   *
+   * If an object is provided for `predicate` the created "_.where" style callback
+   * will return `true` for elements that have the properties of the given object,
+   * else `false`.
+   *
+   * @static
+   * @memberOf _
+   * @category Arrays
+   * @param {Array} array The array to search.
+   * @param {Function|Object|string} [predicate=identity] The function called
+   *  per iteration. If a property name or object is provided it will be used
+   *  to create a "_.pluck" or "_.where" style callback, respectively.
+   * @param {*} [thisArg] The `this` binding of `predicate`.
+   * @returns {number} Returns the index of the found element, else `-1`.
+   * @example
+   *
+   * var characters = [
+   *   { 'name': 'barney',  'age': 36 },
+   *   { 'name': 'fred',    'age': 40, 'blocked': true },
+   *   { 'name': 'pebbles', 'age': 1 }
+   * ];
+   *
+   * _.findIndex(characters, function(chr) {
+   *   return chr.age < 20;
+   * });
+   * // => 2
+   *
+   * // using "_.where" callback shorthand
+   * _.findIndex(characters, { 'age': 36 });
+   * // => 0
+   *
+   * // using "_.pluck" callback shorthand
+   * _.findIndex(characters, 'blocked');
+   * // => 1
+   */
+  function findIndex(array, predicate, thisArg) {
+    var index = -1,
+        length = array ? array.length : 0;
+
+    predicate = createCallback(predicate, thisArg, 3);
+    while (++index < length) {
+      if (predicate(array[index], index, array)) {
+        return index;
+      }
+    }
+    return -1;
+  }
+
   /**
    * Gets the first element of `array`.
    *
@@ -1424,59 +1478,6 @@
     return -1;
   }
 
-  /**
-   * Creates an array of numbers (positive and/or negative) progressing from
-   * `start` up to but not including `end`. If `start` is less than `stop` a
-   * zero-length range is created unless a negative `step` is specified.
-   *
-   * @static
-   * @memberOf _
-   * @category Arrays
-   * @param {number} [start=0] The start of the range.
-   * @param {number} end The end of the range.
-   * @param {number} [step=1] The value to increment or decrement by.
-   * @returns {Array} Returns the new array of numbers.
-   * @example
-   *
-   * _.range(4);
-   * // => [0, 1, 2, 3]
-   *
-   * _.range(1, 5);
-   * // => [1, 2, 3, 4]
-   *
-   * _.range(0, 20, 5);
-   * // => [0, 5, 10, 15]
-   *
-   * _.range(0, -4, -1);
-   * // => [0, -1, -2, -3]
-   *
-   * _.range(1, 4, 0);
-   * // => [1, 1, 1]
-   *
-   * _.range(0);
-   * // => []
-   */
-  function range(start, end, step) {
-    start = +start || 0;
-    step =  (+step || 1);
-
-    if (end == null) {
-      end = start;
-      start = 0;
-    }
-    // use `Array(length)` so engines like Chakra and V8 avoid slower modes
-    // http://youtu.be/XAqIpGU8ZZk#t=17m25s
-    var index = -1,
-        length = nativeMax(0, ceil((end - start) / step)),
-        result = Array(length);
-
-    while (++index < length) {
-      result[index] = start;
-      start += step;
-    }
-    return result;
-  }
-
   /**
    * Gets all but the first element of `array`.
    *
@@ -1518,21 +1519,19 @@
     var index = -1,
         length = array ? array.length : 0;
 
-    if (typeof start == 'undefined') {
-      start = 0;
-    } else if (start < 0) {
+    start |= 0;
+    if (start < 0) {
       start = nativeMax(length + start, 0);
     } else if (start > length) {
       start = length;
     }
-    if (typeof end == 'undefined') {
-      end = length;
-    } else if (end < 0) {
+    end = typeof end == 'undefined' ? length : (end | 0);
+    if (end < 0) {
       end = nativeMax(length + end, 0);
     } else if (end > length) {
       end = length;
     }
-    length = (length = (end - start) | 0) < 0 ? 0 : length;
+    length = start > end ? 0 : (end - start);
 
     var result = Array(length);
     while (++index < length) {
@@ -1944,7 +1943,7 @@
    */
   function contains(collection, target) {
     var indexOf = getIndexOf(),
-        length = collection ? collection.length | 0 : 0,
+        length = (collection && collection.length) | 0,
         result = false;
 
     if (length > 0) {
@@ -2040,7 +2039,7 @@
 
     predicate = createCallback(predicate, thisArg, 3);
     var index = -1,
-        length = collection ? collection.length | 0 : 0;
+        length = (collection && collection.length) | 0;
 
     if (length > 0) {
       while (++index < length) {
@@ -2101,7 +2100,7 @@
 
     predicate = createCallback(predicate, thisArg, 3);
     var index = -1,
-        length = collection ? collection.length | 0 : 0;
+        length = (collection && collection.length) | 0;
 
     if (length > 0) {
       while (++index < length) {
@@ -2164,27 +2163,13 @@
    * // => { 'name': 'fred', 'age': 40, 'blocked': true }
    */
   function find(collection, predicate, thisArg) {
-    predicate = createCallback(predicate, thisArg, 3);
-    var index = -1,
-        length = collection ? collection.length | 0 : 0;
-
+    var length = (collection && collection.length) | 0;
     if (length > 0) {
-      while (++index < length) {
-        var value = collection[index];
-        if (predicate(value, index, collection)) {
-          return value;
-        }
-      }
-    } else {
-      var result;
-      baseEach(collection, function(value, index, collection) {
-        if (predicate(value, index, collection)) {
-          result = value;
-          return breakIndicator;
-        }
-      });
-      return result;
+      var index = findIndex(collection, predicate, thisArg);
+      return index > -1 ? collection[index] : undefined;
     }
+    var key = findKey(collection, predicate, thisArg);
+    return typeof key == 'string' ? collection[key] : undefined;
   }
 
   /**
@@ -2215,7 +2200,7 @@
    */
   function forEach(collection, callback, thisArg) {
     var index = -1,
-        length = collection ? collection.length | 0 : 0;
+        length = (collection && collection.length) | 0;
 
     callback = callback && typeof thisArg == 'undefined' ? callback : baseCreateCallback(callback, thisArg, 3);
     if (length > 0) {
@@ -2342,7 +2327,7 @@
     var args = slice(arguments, 2),
         index = -1,
         isFunc = typeof methodName == 'function',
-        length = collection ? collection.length | 0 : 0,
+        length = (collection && collection.length) | 0,
         result = Array(length < 0 ? 0 : length);
 
     baseEach(collection, function(value) {
@@ -2392,7 +2377,7 @@
    */
   function map(collection, callback, thisArg) {
     var index = -1,
-        length = collection ? collection.length | 0 : 0;
+        length = (collection && collection.length) | 0;
 
     callback = createCallback(callback, thisArg, 3);
     if (length > 0) {
@@ -2459,7 +2444,7 @@
       callback = null;
     }
     var index = -1,
-        length = collection ? collection.length | 0 : 0;
+        length = (collection && collection.length) | 0;
 
     if (callback == null && length > 0) {
       while (++index < length) {
@@ -2532,7 +2517,7 @@
       callback = null;
     }
     var index = -1,
-        length = collection ? collection.length | 0 : 0;
+        length = (collection && collection.length) | 0;
 
     if (callback == null && length > 0) {
       while (++index < length) {
@@ -2660,7 +2645,7 @@
     callback = createCallback(callback, thisArg, 4);
 
     var index = -1,
-        length = collection ? collection.length | 0 : 0;
+        length = (collection && collection.length) | 0;
 
     if (length > 0) {
       if (noaccum && length) {
@@ -2776,7 +2761,7 @@
       collection = values(collection);
     }
     if (n == null || guard) {
-      var length = collection ? collection.length | 0 : 0;
+      var length = (collection && collection.length) | 0;
       return length > 0 ? collection[baseRandom(0, length - 1)] : undefined;
     }
     var result = shuffle(collection);
@@ -2801,7 +2786,7 @@
    */
   function shuffle(collection) {
     var index = -1,
-        length = collection ? collection.length | 0 : 0,
+        length = (collection && collection.length) | 0,
         result = Array(length < 0 ? 0 : length);
 
     baseEach(collection, function(value) {
@@ -2885,7 +2870,7 @@
 
     predicate = createCallback(predicate, thisArg, 3);
     var index = -1,
-        length = collection ? collection.length | 0 : 0;
+        length = (collection && collection.length) | 0;
 
     if (length > 0) {
       while (++index < length) {
@@ -2952,7 +2937,7 @@
    */
   function sortBy(collection, callback, thisArg) {
     var index = -1,
-        length = collection ? collection.length | 0 : 0,
+        length = (collection && collection.length) | 0,
         result = Array(length < 0 ? 0 : length);
 
     callback = createCallback(callback, thisArg, 3);
@@ -3721,6 +3706,60 @@
     return object;
   }
 
+  /**
+   * This method is like `_.findIndex` except that it returns the key of the
+   * first element the predicate returns truthy for, instead of the element itself.
+   *
+   * If a property name is provided for `predicate` the created "_.pluck" style
+   * callback will return the property value of the given element.
+   *
+   * If an object is provided for `predicate` the created "_.where" style callback
+   * will return `true` for elements that have the properties of the given object,
+   * else `false`.
+   *
+   * @static
+   * @memberOf _
+   * @category Objects
+   * @param {Object} object The object to search.
+   * @param {Function|Object|string} [predicate=identity] The function called
+   *  per iteration. If a property name or object is provided it will be used
+   *  to create a "_.pluck" or "_.where" style callback, respectively.
+   * @param {*} [thisArg] The `this` binding of `predicate`.
+   * @returns {string|undefined} Returns the key of the found element, else `undefined`.
+   * @example
+   *
+   * var characters = {
+   *   'barney': { 'age': 36 },
+   *   'fred': { 'age': 40, 'blocked': true },
+   *   'pebbles': { 'age': 1 }
+   * };
+   *
+   * _.findKey(characters, function(chr) {
+   *   return chr.age < 40;
+   * });
+   * // => 'barney' (property order is not guaranteed across environments)
+   *
+   * // using "_.where" callback shorthand
+   * _.findKey(characters, { 'age': 1 });
+   * // => 'pebbles'
+   *
+   * // using "_.pluck" callback shorthand
+   * _.findKey(characters, 'blocked');
+   * // => 'fred'
+   */
+  function findKey(object, predicate, thisArg) {
+    var result;
+
+    predicate = createCallback(predicate, thisArg, 3);
+    baseForOwn(object, function(value, key, object) {
+      if (predicate(value, key, object)) {
+        result = key;
+        return breakIndicator;
+      }
+    });
+    return result;
+  }
+
   /**
    * Creates a sorted array of property names of all enumerable properties,
    * own and inherited, of `object` that have function values.
@@ -3814,7 +3853,7 @@
    * @returns {boolean} Returns `true` if the `value` is an `arguments` object, else `false`.
    * @example
    *
-   * (function() { return _.isArguments(arguments); })(1, 2, 3);
+   * (function() { return _.isArguments(arguments); })();
    * // => true
    *
    * _.isArguments([1, 2, 3]);
@@ -3843,11 +3882,11 @@
    * @returns {boolean} Returns `true` if the `value` is an array, else `false`.
    * @example
    *
-   * (function() { return _.isArray(arguments); })();
-   * // => false
-   *
    * _.isArray([1, 2, 3]);
    * // => true
+   *
+   * (function() { return _.isArray(arguments); })();
+   * // => false
    */
   var isArray = nativeIsArray || function(value) {
     return value && typeof value == 'object' && typeof value.length == 'number' &&
@@ -3864,6 +3903,9 @@
    * @returns {boolean} Returns `true` if the `value` is a boolean value, else `false`.
    * @example
    *
+   * _.isBoolean(false);
+   * // => true
+   *
    * _.isBoolean(null);
    * // => false
    */
@@ -3884,6 +3926,9 @@
    *
    * _.isDate(new Date);
    * // => true
+   *
+   * _.isDate('Wed May 23 2012');
+   * // => false
    */
   function isDate(value) {
     return value && typeof value == 'object' && toString.call(value) == dateClass || false;
@@ -3901,6 +3946,9 @@
    *
    * _.isElement(document.body);
    * // => true
+   *
+   * _.isElement('<body>');
+   * // => false
    */
   function isElement(value) {
     return value && value.nodeType === 1 || false;
@@ -3918,14 +3966,20 @@
    * @returns {boolean} Returns `true` if the `value` is empty, else `false`.
    * @example
    *
+   * _.isEmpty(null);
+   * // => true
+   *
+   * _.isEmpty(true);
+   * // => true
+   *
+   * _.isEmpty(1);
+   * // => true
+   *
    * _.isEmpty([1, 2, 3]);
    * // => false
    *
-   * _.isEmpty({});
-   * // => true
-   *
-   * _.isEmpty('');
-   * // => true
+   * _.isEmpty({ 'a': 1 });
+   * // => false
    */
   function isEmpty(value) {
     if (!value) {
@@ -4029,6 +4083,9 @@
    *
    * _.isFunction(_);
    * // => true
+   *
+   * _.isFunction(/abc/);
+   * // => false
    */
   function isFunction(value) {
     return typeof value == 'function';
@@ -4114,7 +4171,7 @@
    * _.isNull(null);
    * // => true
    *
-   * _.isNull(undefined);
+   * _.isNull(void 0);
    * // => false
    */
   function isNull(value) {
@@ -4134,8 +4191,14 @@
    * @returns {boolean} Returns `true` if the `value` is a number, else `false`.
    * @example
    *
-   * _.isNumber(8.4 * 5);
+   * _.isNumber(8.4);
    * // => true
+   *
+   * _.isNumber(NaN);
+   * // => true
+   *
+   * _.isNumber('8.4');
+   * // => false
    */
   function isNumber(value) {
     var type = typeof value;
@@ -4153,8 +4216,11 @@
    * @returns {boolean} Returns `true` if the `value` is a regular expression, else `false`.
    * @example
    *
-   * _.isRegExp(/fred/);
+   * _.isRegExp(/abc/);
    * // => true
+   *
+   * _.isRegExp('/abc/');
+   * // => false
    */
   function isRegExp(value) {
     var type = typeof value;
@@ -4172,8 +4238,11 @@
    * @returns {boolean} Returns `true` if the `value` is a string, else `false`.
    * @example
    *
-   * _.isString('fred');
+   * _.isString('abc');
    * // => true
+   *
+   * _.isString(1);
+   * // => false
    */
   function isString(value) {
     return typeof value == 'string' ||
@@ -4192,6 +4261,9 @@
    *
    * _.isUndefined(void 0);
    * // => true
+   *
+   * _.isUndefined(null);
+   * // => false
    */
   function isUndefined(value) {
     return typeof value == 'undefined';
@@ -4889,16 +4961,71 @@
     if (min == null && max == null) {
       max = 1;
     }
-    min = +min || 0;
+    min |= 0;
     if (max == null) {
       max = min;
       min = 0;
     } else {
-      max = +max || 0;
+      max |= 0;
     }
     return min + floor(nativeRandom() * (max - min + 1));
   }
 
+  /**
+   * Creates an array of numbers (positive and/or negative) progressing from
+   * `start` up to but not including `end`. If `start` is less than `stop` a
+   * zero-length range is created unless a negative `step` is specified.
+   *
+   * @static
+   * @memberOf _
+   * @category Utilities
+   * @param {number} [start=0] The start of the range.
+   * @param {number} end The end of the range.
+   * @param {number} [step=1] The value to increment or decrement by.
+   * @returns {Array} Returns the new array of numbers.
+   * @example
+   *
+   * _.range(4);
+   * // => [0, 1, 2, 3]
+   *
+   * _.range(1, 5);
+   * // => [1, 2, 3, 4]
+   *
+   * _.range(0, 20, 5);
+   * // => [0, 5, 10, 15]
+   *
+   * _.range(0, -4, -1);
+   * // => [0, -1, -2, -3]
+   *
+   * _.range(1, 4, 0);
+   * // => [1, 1, 1]
+   *
+   * _.range(0);
+   * // => []
+   */
+  function range(start, end, step) {
+    start = +start || 0;
+    step = step == null ? 1 : (+step || 0);
+
+    if (end == null) {
+      end = start;
+      start = 0;
+    } else {
+      end = +end || 0;
+    }
+    // use `Array(length)` so engines like Chakra and V8 avoid slower modes
+    // http://youtu.be/XAqIpGU8ZZk#t=17m25s
+    var index = -1,
+        length = nativeMax(0, ceil((end - start) / step)),
+        result = Array(length);
+
+    while (++index < length) {
+      result[index] = start;
+      start += step;
+    }
+    return result;
+  }
+
   /**
    * Resolves the value of property `key` on `object`. If `key` is a function
    * it will be invoked with the `this` binding of `object` and its result
diff --git a/dist/lodash.underscore.min.js b/dist/lodash.underscore.min.js
index 01b0a3855..a9d323a29 100644
--- a/dist/lodash.underscore.min.js
+++ b/dist/lodash.underscore.min.js
@@ -4,36 +4,37 @@
  * Build: `lodash underscore -o ./dist/lodash.underscore.js`
  */
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