diff --git a/dist/lodash.compat.js b/dist/lodash.compat.js
index f31211704..119c4d780 100644
--- a/dist/lodash.compat.js
+++ b/dist/lodash.compat.js
@@ -4517,6 +4517,9 @@
      * binding of `thisArg` and prepends any additional `bind` arguments to those
      * provided to the bound function.
      *
+     * Note: Unlike native `Function#bind` this method does not set the `length`
+     * property of bound functions.
+     *
      * @static
      * @memberOf _
      * @category Functions
@@ -4546,6 +4549,8 @@
      * of method names. If no method names are provided all the function properties
      * of `object` will be bound.
      *
+     * Note: This method does not set the `length` property of bound functions.
+     *
      * @static
      * @memberOf _
      * @category Functions
@@ -4674,6 +4679,8 @@
      * remaining `func` arguments, and so on. The arity of `func` can be specified
      * if `func.length` is not sufficient.
      *
+     * Note: This method does not set the `length` property of curried functions.
+     *
      * @static
      * @memberOf _
      * @category Functions
@@ -4982,6 +4989,9 @@
      * `partial` arguments prepended to those provided to the new function. This
      * method is similar to `_.bind` except it does **not** alter the `this` binding.
      *
+     * Note: This method does not set the `length` property of partially applied
+     * functions.
+     *
      * @static
      * @memberOf _
      * @category Functions
@@ -5003,6 +5013,9 @@
      * This method is like `_.partial` except that `partial` arguments are
      * appended to those provided to the new function.
      *
+     * Note: This method does not set the `length` property of partially applied
+     * functions.
+     *
      * @static
      * @memberOf _
      * @category Functions
@@ -5137,10 +5150,10 @@
      * defaults(object, { 'name': 'fred', 'employer': 'slate' });
      * // => { 'name': 'barney', 'employer': 'slate' }
      */
-    function assign(object, source, guard) {
+    function assign(object, source) {
       var args = arguments,
           argsIndex = 0,
-          argsLength = typeof guard == 'number' ? 2 : args.length;
+          argsLength = args[3] && args[3][args[2]] === source ? 2 : args.length;
 
       if (argsLength > 3 && typeof args[argsLength - 2] == 'function') {
         var callback = baseCreateCallback(args[--argsLength - 1], args[argsLength--], 2);
@@ -5306,8 +5319,6 @@
      * @category Objects
      * @param {Object} object The destination object.
      * @param {...Object} [source] The source objects.
-     * @param- {Object} [guard] Allows working with `_.reduce` without using its
-     *  `key` and `object` arguments as sources.
      * @returns {Object} Returns the destination object.
      * @example
      *
@@ -5315,10 +5326,10 @@
      * _.defaults(object, { 'name': 'fred', 'employer': 'slate' });
      * // => { 'name': 'barney', 'employer': 'slate' }
      */
-    function defaults(object, source, guard) {
+    function defaults(object, source) {
       var args = arguments,
           argsIndex = 0,
-          argsLength = typeof guard == 'number' ? 2 : args.length;
+          argsLength = args[3] && args[3][args[2]] === source ? 2 : args.length;
 
       while (++argsIndex < argsLength) {
         source = args[argsIndex];
@@ -5854,8 +5865,8 @@
     /**
      * Checks if `value` is, or can be coerced to, a finite number.
      *
-     * Note: This is not the same as native `isFinite` which will return true for
-     * booleans and empty strings. See the [ES5 spec](http://es5.github.io/#x15.1.2.5)
+     * Note: This method is not the same as native `isFinite` which will return
+     * `true` for booleans and empty strings. See the [ES5 spec](http://es5.github.io/#x15.1.2.5)
      * for more details.
      *
      * @static
@@ -5938,8 +5949,8 @@
     /**
      * Checks if `value` is `NaN`.
      *
-     * Note: This is not the same as native `isNaN` which will return `true` for
-     * `undefined` and other non-numeric values. See the [ES5 spec](http://es5.github.io/#x15.1.2.4)
+     * Note: This method is not the same as native `isNaN` which will return `true`
+     * for `undefined` and other non-numeric values. See the [ES5 spec](http://es5.github.io/#x15.1.2.4)
      * for more details.
      *
      * @static
@@ -6379,7 +6390,7 @@
     }
 
     /**
-     * An alternative to `_.reduce` this method transforms `object` to a new
+     * An alternative to `_.reduce`; this method transforms `object` to a new
      * `accumulator` object which is the result of running each of its own
      * enumerable properties through a callback, with each callback execution
      * potentially mutating the `accumulator` object. The callback is bound to
diff --git a/dist/lodash.compat.min.js b/dist/lodash.compat.min.js
index 713657e82..3b7b2dd71 100644
--- a/dist/lodash.compat.min.js
+++ b/dist/lodash.compat.min.js
@@ -27,8 +27,8 @@ if(t=e.createCallback(t,r,3),le(n)){r=-1;for(var o=n.length;++r<o&&(u=!!t(n[r],r
 else lt(n,function(n,r,e){a[++u]=t(n,r,e)});return a}function Bt(n,t,r){var o=-1/0,a=o;if(typeof t!="function"&&r&&r[t]===n&&(t=null),null==t&&le(n)){r=-1;for(var i=n.length;++r<i;){var l=n[r];l>a&&(a=l)}}else t=null==t&&rr(n)?u:e.createCallback(t,r,3),lt(n,function(n,r,e){r=t(n,r,e),r>o&&(o=r,a=n)});return a}function Wt(n,t,r,u){var o=3>arguments.length;if(t=e.createCallback(t,u,4),le(n)){var a=-1,i=n.length;for(o&&i&&(r=n[++a]);++a<i;)r=t(r,n[a],a,n)}else lt(n,function(n,e,u){r=o?(o=false,n):t(r,n,e,u)
 });return r}function zt(n,t,r,u){var o=3>arguments.length;return t=e.createCallback(t,u,4),$t(n,function(n,e,u){r=o?(o=false,n):t(r,n,e,u)}),r}function Kt(n){var t=-1,r=n?n.length:0,e=fr(typeof r=="number"?r:0);return Ft(n,function(n){var r=gt(0,++t);e[t]=e[r],e[r]=n}),e}function Mt(n,t,r){var u;if(t=e.createCallback(t,r,3),le(n)){r=-1;for(var o=n.length;++r<o&&!(u=t(n[r],r,n)););}else lt(n,function(n,r,e){return!(u=t(n,r,e))});return!!u}function Ut(n,t){return 2<arguments.length?dt(n,17,Et(arguments,2),null,t):dt(n,1,null,null,t)
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-"undefined"==typeof n[f]&&(n[f]=t[f])}return n}function Ht(n,t,r){var e=-1,u=ce(n),o=u.length;for(t=t&&typeof r=="undefined"?t:k(t,r,3);++e<o&&(r=u[e],false!==t(n[r],r,n)););return n}function Jt(n,t,r){var e=ce(n),u=e.length;for(t=k(t,r,3);u--&&(r=e[u],false!==t(n[r],r,n)););return n}function Qt(n){var t=[];return ie(n,function(n,r){Zt(n)&&t.push(r)}),t.sort()}function Yt(n){return n&&typeof n=="object"&&1===n.nodeType&&(ne.nodeClass?-1<kr.call(n).indexOf("Element"):g(n))||false}function Zt(n){return typeof n=="function"
+var y=p-(a-c),m=0>=y;m?(u&&(u=Sr(u)),c=a,o=n.apply(i,e)):u||(u=Dr(v,y))}return m&&l?l=Sr(l):l||t===p||(l=Dr(g,t)),r&&(m=true,o=n.apply(i,e)),!m||l||u||(e=i=null),o}}function Xt(n,t){var r=arguments,e=0,u=r[3]&&r[3][r[2]]===t?2:r.length;if(3<u&&"function"==typeof r[u-2])var o=k(r[--u-1],r[u--],2);else 2<u&&"function"==typeof r[u-1]&&(o=r[--u]);for(;++e<u;)if(t=r[e],nr(t))for(var a=-1,i=ce(t),l=i.length;++a<l;){var f=i[a];n[f]=o?o(n[f],t[f]):t[f]}return n}function Gt(n,t){for(var r=arguments,e=0,u=r[3]&&r[3][r[2]]===t?2:r.length;++e<u;)if(t=r[e],nr(t))for(var o=-1,a=ce(t),i=a.length;++o<i;){var l=a[o];
+"undefined"==typeof n[l]&&(n[l]=t[l])}return n}function Ht(n,t,r){var e=-1,u=ce(n),o=u.length;for(t=t&&typeof r=="undefined"?t:k(t,r,3);++e<o&&(r=u[e],false!==t(n[r],r,n)););return n}function Jt(n,t,r){var e=ce(n),u=e.length;for(t=k(t,r,3);u--&&(r=e[u],false!==t(n[r],r,n)););return n}function Qt(n){var t=[];return ie(n,function(n,r){Zt(n)&&t.push(r)}),t.sort()}function Yt(n){return n&&typeof n=="object"&&1===n.nodeType&&(ne.nodeClass?-1<kr.call(n).indexOf("Element"):g(n))||false}function Zt(n){return typeof n=="function"
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diff --git a/dist/lodash.js b/dist/lodash.js
index f532ca2ac..f40eafbf6 100644
--- a/dist/lodash.js
+++ b/dist/lodash.js
@@ -4202,6 +4202,9 @@
      * binding of `thisArg` and prepends any additional `bind` arguments to those
      * provided to the bound function.
      *
+     * Note: Unlike native `Function#bind` this method does not set the `length`
+     * property of bound functions.
+     *
      * @static
      * @memberOf _
      * @category Functions
@@ -4231,6 +4234,8 @@
      * of method names. If no method names are provided all the function properties
      * of `object` will be bound.
      *
+     * Note: This method does not set the `length` property of bound functions.
+     *
      * @static
      * @memberOf _
      * @category Functions
@@ -4359,6 +4364,8 @@
      * remaining `func` arguments, and so on. The arity of `func` can be specified
      * if `func.length` is not sufficient.
      *
+     * Note: This method does not set the `length` property of curried functions.
+     *
      * @static
      * @memberOf _
      * @category Functions
@@ -4667,6 +4674,9 @@
      * `partial` arguments prepended to those provided to the new function. This
      * method is similar to `_.bind` except it does **not** alter the `this` binding.
      *
+     * Note: This method does not set the `length` property of partially applied
+     * functions.
+     *
      * @static
      * @memberOf _
      * @category Functions
@@ -4688,6 +4698,9 @@
      * This method is like `_.partial` except that `partial` arguments are
      * appended to those provided to the new function.
      *
+     * Note: This method does not set the `length` property of partially applied
+     * functions.
+     *
      * @static
      * @memberOf _
      * @category Functions
@@ -4822,10 +4835,10 @@
      * defaults(object, { 'name': 'fred', 'employer': 'slate' });
      * // => { 'name': 'barney', 'employer': 'slate' }
      */
-    function assign(object, source, guard) {
+    function assign(object, source) {
       var args = arguments,
           argsIndex = 0,
-          argsLength = typeof guard == 'number' ? 2 : args.length;
+          argsLength = args[3] && args[3][args[2]] === source ? 2 : args.length;
 
       if (argsLength > 3 && typeof args[argsLength - 2] == 'function') {
         var callback = baseCreateCallback(args[--argsLength - 1], args[argsLength--], 2);
@@ -4991,8 +5004,6 @@
      * @category Objects
      * @param {Object} object The destination object.
      * @param {...Object} [source] The source objects.
-     * @param- {Object} [guard] Allows working with `_.reduce` without using its
-     *  `key` and `object` arguments as sources.
      * @returns {Object} Returns the destination object.
      * @example
      *
@@ -5000,10 +5011,10 @@
      * _.defaults(object, { 'name': 'fred', 'employer': 'slate' });
      * // => { 'name': 'barney', 'employer': 'slate' }
      */
-    function defaults(object, source, guard) {
+    function defaults(object, source) {
       var args = arguments,
           argsIndex = 0,
-          argsLength = typeof guard == 'number' ? 2 : args.length;
+          argsLength = args[3] && args[3][args[2]] === source ? 2 : args.length;
 
       while (++argsIndex < argsLength) {
         source = args[argsIndex];
@@ -5544,8 +5555,8 @@
     /**
      * Checks if `value` is, or can be coerced to, a finite number.
      *
-     * Note: This is not the same as native `isFinite` which will return true for
-     * booleans and empty strings. See the [ES5 spec](http://es5.github.io/#x15.1.2.5)
+     * Note: This method is not the same as native `isFinite` which will return
+     * `true` for booleans and empty strings. See the [ES5 spec](http://es5.github.io/#x15.1.2.5)
      * for more details.
      *
      * @static
@@ -5622,8 +5633,8 @@
     /**
      * Checks if `value` is `NaN`.
      *
-     * Note: This is not the same as native `isNaN` which will return `true` for
-     * `undefined` and other non-numeric values. See the [ES5 spec](http://es5.github.io/#x15.1.2.4)
+     * Note: This method is not the same as native `isNaN` which will return `true`
+     * for `undefined` and other non-numeric values. See the [ES5 spec](http://es5.github.io/#x15.1.2.4)
      * for more details.
      *
      * @static
@@ -6059,7 +6070,7 @@
     }
 
     /**
-     * An alternative to `_.reduce` this method transforms `object` to a new
+     * An alternative to `_.reduce`; this method transforms `object` to a new
      * `accumulator` object which is the result of running each of its own
      * enumerable properties through a callback, with each callback execution
      * potentially mutating the `accumulator` object. The callback is bound to
diff --git a/dist/lodash.min.js b/dist/lodash.min.js
index 55b741710..dded00773 100644
--- a/dist/lodash.min.js
+++ b/dist/lodash.min.js
@@ -6,9 +6,9 @@
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diff --git a/dist/lodash.underscore.js b/dist/lodash.underscore.js
index a1fd19e5b..c3fbf450e 100644
--- a/dist/lodash.underscore.js
+++ b/dist/lodash.underscore.js
@@ -3041,6 +3041,9 @@
    * binding of `thisArg` and prepends any additional `bind` arguments to those
    * provided to the bound function.
    *
+   * Note: Unlike native `Function#bind` this method does not set the `length`
+   * property of bound functions.
+   *
    * @static
    * @memberOf _
    * @category Functions
@@ -3070,6 +3073,8 @@
    * of method names. If no method names are provided all the function properties
    * of `object` will be bound.
    *
+   * Note: This method does not set the `length` property of bound functions.
+   *
    * @static
    * @memberOf _
    * @category Functions
@@ -3426,6 +3431,9 @@
    * `partial` arguments prepended to those provided to the new function. This
    * method is similar to `_.bind` except it does **not** alter the `this` binding.
    *
+   * Note: This method does not set the `length` property of partially applied
+   * functions.
+   *
    * @static
    * @memberOf _
    * @category Functions
@@ -3622,8 +3630,6 @@
    * @category Objects
    * @param {Object} object The destination object.
    * @param {...Object} [source] The source objects.
-   * @param- {Object} [guard] Allows working with `_.reduce` without using its
-   *  `key` and `object` arguments as sources.
    * @returns {Object} Returns the destination object.
    * @example
    *
@@ -3973,8 +3979,8 @@
   /**
    * Checks if `value` is, or can be coerced to, a finite number.
    *
-   * Note: This is not the same as native `isFinite` which will return true for
-   * booleans and empty strings. See the [ES5 spec](http://es5.github.io/#x15.1.2.5)
+   * Note: This method is not the same as native `isFinite` which will return
+   * `true` for booleans and empty strings. See the [ES5 spec](http://es5.github.io/#x15.1.2.5)
    * for more details.
    *
    * @static
@@ -4057,8 +4063,8 @@
   /**
    * Checks if `value` is `NaN`.
    *
-   * Note: This is not the same as native `isNaN` which will return `true` for
-   * `undefined` and other non-numeric values. See the [ES5 spec](http://es5.github.io/#x15.1.2.4)
+   * Note: This method is not the same as native `isNaN` which will return `true`
+   * for `undefined` and other non-numeric values. See the [ES5 spec](http://es5.github.io/#x15.1.2.4)
    * for more details.
    *
    * @static
diff --git a/lodash.js b/lodash.js
index df5b0cd78..804b91fa2 100644
--- a/lodash.js
+++ b/lodash.js
@@ -5169,10 +5169,10 @@
      * defaults(object, { 'name': 'fred', 'employer': 'slate' });
      * // => { 'name': 'barney', 'employer': 'slate' }
      */
-    function assign(object, source, guard) {
+    function assign(object, source) {
       var args = arguments,
           argsIndex = 0,
-          argsLength = typeof guard == 'number' ? 2 : args.length;
+          argsLength = args[3] && args[3][args[2]] === source ? 2 : args.length;
 
       if (argsLength > 3 && typeof args[argsLength - 2] == 'function') {
         var callback = baseCreateCallback(args[--argsLength - 1], args[argsLength--], 2);
@@ -5338,8 +5338,6 @@
      * @category Objects
      * @param {Object} object The destination object.
      * @param {...Object} [source] The source objects.
-     * @param- {Object} [guard] Allows working with `_.reduce` without using its
-     *  `key` and `object` arguments as sources.
      * @returns {Object} Returns the destination object.
      * @example
      *
@@ -5347,10 +5345,10 @@
      * _.defaults(object, { 'name': 'fred', 'employer': 'slate' });
      * // => { 'name': 'barney', 'employer': 'slate' }
      */
-    function defaults(object, source, guard) {
+    function defaults(object, source) {
       var args = arguments,
           argsIndex = 0,
-          argsLength = typeof guard == 'number' ? 2 : args.length;
+          argsLength = args[3] && args[3][args[2]] === source ? 2 : args.length;
 
       while (++argsIndex < argsLength) {
         source = args[argsIndex];