diff --git a/dist/lodash.compat.js b/dist/lodash.compat.js
index e0828ed4e..b1496e2b7 100644
--- a/dist/lodash.compat.js
+++ b/dist/lodash.compat.js
@@ -2419,7 +2419,8 @@
      * // => false
      */
     function isBoolean(value) {
-      return value === true || value === false || toString.call(value) == boolClass;
+      return value === true || value === false ||
+        value && typeof value == 'object' && toString.call(value) == boolClass || false;
     }
 
     /**
@@ -2436,7 +2437,7 @@
      * // => true
      */
     function isDate(value) {
-      return value ? (typeof value == 'object' && toString.call(value) == dateClass) : false;
+      return value && typeof value == 'object' && toString.call(value) == dateClass || false;
     }
 
     /**
@@ -2453,7 +2454,7 @@
      * // => true
      */
     function isElement(value) {
-      return value ? value.nodeType === 1 : false;
+      return value && value.nodeType === 1 || false;
     }
 
     /**
@@ -2688,7 +2689,8 @@
      * // => true
      */
     function isNumber(value) {
-      return typeof value == 'number' || toString.call(value) == numberClass;
+      return typeof value == 'number' ||
+        value && typeof value == 'object' && toString.call(value) == numberClass || false;
     }
 
     /**
@@ -2741,7 +2743,7 @@
      * // => true
      */
     function isRegExp(value) {
-      return (value && objectTypes[typeof value]) ? toString.call(value) == regexpClass : false;
+      return value && objectTypes[typeof value] && toString.call(value) == regexpClass || false;
     }
 
     /**
@@ -2758,7 +2760,8 @@
      * // => true
      */
     function isString(value) {
-      return typeof value == 'string' || toString.call(value) == stringClass;
+      return typeof value == 'string' ||
+        value && typeof value == 'object' && toString.call(value) == stringClass || false;
     }
 
     /**
@@ -5896,12 +5899,11 @@
      * @returns {Function} Returns the new function.
      * @example
      *
-     * var hello = function(name) { return 'hello ' + name; };
-     * hello = _.wrap(hello, function(func) {
-     *   return 'before, ' + func('fred') + ', after';
+     * var pre= _.wrap(_.escape, function(func, text) {
+     *   return '<div>' + func(text) + '</div>';
      * });
-     * hello();
-     * // => 'before, hello fred, after'
+     * pre('Fred, Wilma, & Pebbles');
+     * // => '<div>Fred, Wilma, &amp; Pebbles</div>'
      */
     function wrap(value, wrapper) {
       if (!isFunction(wrapper)) {
@@ -5945,7 +5947,7 @@
      * @example
      *
      * var object = { 'name': 'fred' };
-     * object === _.identity(object);
+     * _.identity(object) === object;
      * // => true
      */
     function identity(value) {
diff --git a/dist/lodash.compat.min.js b/dist/lodash.compat.min.js
index c2b891cf4..545d1e4ed 100644
--- a/dist/lodash.compat.min.js
+++ b/dist/lodash.compat.min.js
@@ -17,9 +17,9 @@ if(!a||i||l||p||!(We.fastBind||Se&&c))v=function(){var g=arguments,h=a?u:this;re
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 else if(r+="for(n in t){",e.j&&u.push("m.call(t, n)"),u.length&&(r+="if("+u.join("&&")+"){"),r+=e.g+";",u.length&&(r+="}"),r+="}",We.nonEnumShadows){for(r+="if(t!==A){var i=t.constructor,r=t===(i&&i.prototype),f=t===J?I:t===k?j:L.call(t),x=y[f];",k=0;7>k;k++)r+="n='"+e.h[k]+"';if((!(r&&x[n])&&m.call(t,n))",e.j||(r+="||(!x[n]&&t[n]!==A[n])"),r+="){"+e.g+"}";r+="}"}return(e.b||We.nonEnumArgs)&&(r+="}"),r+=e.c+";return E",n("d,j,k,m,o,p,q,s,v,A,B,y,I,J,L",t+r+"}")(Z,K,le,de,_,yt,Je,xt,X.f,fe,Y,Ke,H,ce,ke)
 }function pt(n){return wt(n)?Ie(n):{}}function st(n){return Xe[n]}function gt(){var t=(t=y.indexOf)===Tt?n:t;return t}function ht(n){var t,e;return!n||ke.call(n)!=J||(t=n.constructor,bt(t)&&!(t instanceof t))||!We.argsClass&&yt(n)||!We.nodeClass&&f(n)?!1:We.ownLast?(ur(n,function(n,t,r){return e=de.call(r,t),!1}),false!==e):(ur(n,function(n,t){e=t}),typeof e=="undefined"||de.call(n,e))}function vt(n){return Ye[n]}function yt(n){return n&&typeof n=="object"&&typeof n.length=="number"&&ke.call(n)==L||!1
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@@ -44,8 +44,8 @@ for(var u=Xt(t);++r<t;)u[r]=n,n+=e;return u},y.reject=function(n,t,e){return t=y
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diff --git a/dist/lodash.js b/dist/lodash.js
index 98e712937..be1e5a277 100644
--- a/dist/lodash.js
+++ b/dist/lodash.js
@@ -2086,7 +2086,8 @@
      * // => false
      */
     function isBoolean(value) {
-      return value === true || value === false || toString.call(value) == boolClass;
+      return value === true || value === false ||
+        value && typeof value == 'object' && toString.call(value) == boolClass || false;
     }
 
     /**
@@ -2103,7 +2104,7 @@
      * // => true
      */
     function isDate(value) {
-      return value ? (typeof value == 'object' && toString.call(value) == dateClass) : false;
+      return value && typeof value == 'object' && toString.call(value) == dateClass || false;
     }
 
     /**
@@ -2120,7 +2121,7 @@
      * // => true
      */
     function isElement(value) {
-      return value ? value.nodeType === 1 : false;
+      return value && value.nodeType === 1 || false;
     }
 
     /**
@@ -2348,7 +2349,8 @@
      * // => true
      */
     function isNumber(value) {
-      return typeof value == 'number' || toString.call(value) == numberClass;
+      return typeof value == 'number' ||
+        value && typeof value == 'object' && toString.call(value) == numberClass || false;
     }
 
     /**
@@ -2401,7 +2403,7 @@
      * // => true
      */
     function isRegExp(value) {
-      return value ? (typeof value == 'object' && toString.call(value) == regexpClass) : false;
+      return value && typeof value == 'object' && toString.call(value) == regexpClass || false;
     }
 
     /**
@@ -2418,7 +2420,8 @@
      * // => true
      */
     function isString(value) {
-      return typeof value == 'string' || toString.call(value) == stringClass;
+      return typeof value == 'string' ||
+        value && typeof value == 'object' && toString.call(value) == stringClass || false;
     }
 
     /**
@@ -5557,12 +5560,11 @@
      * @returns {Function} Returns the new function.
      * @example
      *
-     * var hello = function(name) { return 'hello ' + name; };
-     * hello = _.wrap(hello, function(func) {
-     *   return 'before, ' + func('fred') + ', after';
+     * var pre= _.wrap(_.escape, function(func, text) {
+     *   return '<div>' + func(text) + '</div>';
      * });
-     * hello();
-     * // => 'before, hello fred, after'
+     * pre('Fred, Wilma, & Pebbles');
+     * // => '<div>Fred, Wilma, &amp; Pebbles</div>'
      */
     function wrap(value, wrapper) {
       if (!isFunction(wrapper)) {
@@ -5606,7 +5608,7 @@
      * @example
      *
      * var object = { 'name': 'fred' };
-     * object === _.identity(object);
+     * _.identity(object) === object;
      * // => true
      */
     function identity(value) {
diff --git a/dist/lodash.min.js b/dist/lodash.min.js
index 8f46ae211..d5ebd6d9c 100644
--- a/dist/lodash.min.js
+++ b/dist/lodash.min.js
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diff --git a/dist/lodash.underscore.js b/dist/lodash.underscore.js
index f4ca0c3e8..1c0242f3a 100644
--- a/dist/lodash.underscore.js
+++ b/dist/lodash.underscore.js
@@ -1187,7 +1187,8 @@
    * // => false
    */
   function isBoolean(value) {
-    return value === true || value === false || toString.call(value) == boolClass;
+    return value === true || value === false ||
+      value && typeof value == 'object' && toString.call(value) == boolClass || false;
   }
 
   /**
@@ -1204,7 +1205,7 @@
    * // => true
    */
   function isDate(value) {
-    return value ? (typeof value == 'object' && toString.call(value) == dateClass) : false;
+    return value && typeof value == 'object' && toString.call(value) == dateClass || false;
   }
 
   /**
@@ -1221,7 +1222,7 @@
    * // => true
    */
   function isElement(value) {
-    return value ? value.nodeType === 1 : false;
+    return value && value.nodeType === 1 || false;
   }
 
   /**
@@ -1452,7 +1453,8 @@
    * // => true
    */
   function isNumber(value) {
-    return typeof value == 'number' || toString.call(value) == numberClass;
+    return typeof value == 'number' ||
+      value && typeof value == 'object' && toString.call(value) == numberClass || false;
   }
 
   /**
@@ -1469,7 +1471,7 @@
    * // => true
    */
   function isRegExp(value) {
-    return (value && objectTypes[typeof value]) ? toString.call(value) == regexpClass : false;
+    return value && objectTypes[typeof value] && toString.call(value) == regexpClass || false;
   }
 
   /**
@@ -1486,7 +1488,8 @@
    * // => true
    */
   function isString(value) {
-    return typeof value == 'string' || toString.call(value) == stringClass;
+    return typeof value == 'string' ||
+      value && typeof value == 'object' && toString.call(value) == stringClass || false;
   }
 
   /**
@@ -4063,12 +4066,11 @@
    * @returns {Function} Returns the new function.
    * @example
    *
-   * var hello = function(name) { return 'hello ' + name; };
-   * hello = _.wrap(hello, function(func) {
-   *   return 'before, ' + func('fred') + ', after';
+   * var pre= _.wrap(_.escape, function(func, text) {
+   *   return '<div>' + func(text) + '</div>';
    * });
-   * hello();
-   * // => 'before, hello fred, after'
+   * pre('Fred, Wilma, & Pebbles');
+   * // => '<div>Fred, Wilma, &amp; Pebbles</div>'
    */
   function wrap(value, wrapper) {
     if (!isFunction(wrapper)) {
@@ -4112,7 +4114,7 @@
    * @example
    *
    * var object = { 'name': 'fred' };
-   * object === _.identity(object);
+   * _.identity(object) === object;
    * // => true
    */
   function identity(value) {
diff --git a/dist/lodash.underscore.min.js b/dist/lodash.underscore.min.js
index e99c5d5db..fb52a3db9 100644
--- a/dist/lodash.underscore.min.js
+++ b/dist/lodash.underscore.min.js
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     function isBoolean(value) {
-      return value === true || value === false || toString.call(value) == boolClass;
+      return value === true || value === false ||
+        value && typeof value == 'object' && toString.call(value) == boolClass || false;
     }
 
     /**
@@ -2453,7 +2454,7 @@
      * // => true
      */
     function isDate(value) {
-      return value ? (typeof value == 'object' && toString.call(value) == dateClass) : false;
+      return value && typeof value == 'object' && toString.call(value) == dateClass || false;
     }
 
     /**
@@ -2470,7 +2471,7 @@
      * // => true
      */
     function isElement(value) {
-      return value ? value.nodeType === 1 : false;
+      return value && value.nodeType === 1 || false;
     }
 
     /**
@@ -2705,7 +2706,8 @@
      * // => true
      */
     function isNumber(value) {
-      return typeof value == 'number' || toString.call(value) == numberClass;
+      return typeof value == 'number' ||
+        value && typeof value == 'object' && toString.call(value) == numberClass || false;
     }
 
     /**
@@ -2758,7 +2760,7 @@
      * // => true
      */
     function isRegExp(value) {
-      return (value && objectTypes[typeof value]) ? toString.call(value) == regexpClass : false;
+      return value && objectTypes[typeof value] && toString.call(value) == regexpClass || false;
     }
 
     /**
@@ -2775,7 +2777,8 @@
      * // => true
      */
     function isString(value) {
-      return typeof value == 'string' || toString.call(value) == stringClass;
+      return typeof value == 'string' ||
+        value && typeof value == 'object' && toString.call(value) == stringClass || false;
     }
 
     /**
@@ -5913,12 +5916,11 @@
      * @returns {Function} Returns the new function.
      * @example
      *
-     * var hello = function(name) { return 'hello ' + name; };
-     * hello = _.wrap(hello, function(func) {
-     *   return 'before, ' + func('fred') + ', after';
+     * var pre= _.wrap(_.escape, function(func, text) {
+     *   return '<div>' + func(text) + '</div>';
      * });
-     * hello();
-     * // => 'before, hello fred, after'
+     * pre('Fred, Wilma, & Pebbles');
+     * // => '<div>Fred, Wilma, &amp; Pebbles</div>'
      */
     function wrap(value, wrapper) {
       if (!isFunction(wrapper)) {
@@ -5962,7 +5964,7 @@
      * @example
      *
      * var object = { 'name': 'fred' };
-     * object === _.identity(object);
+     * _.identity(object) === object;
      * // => true
      */
     function identity(value) {