diff --git a/doc/README.md b/doc/README.md
index 8a7b65cd3..1ee423556 100644
--- a/doc/README.md
+++ b/doc/README.md
@@ -2993,7 +2993,7 @@ _.uniqueId();
 <!-- div -->
 
 ### <a id="_version"></a>`_.VERSION`
-<a href="#_version">#</a> [&#x24C8;](https://github.com/bestiejs/lodash/blob/master/lodash.js#L4319 "View in source") [&#x24C9;][1]
+<a href="#_version">#</a> [&#x24C8;](https://github.com/bestiejs/lodash/blob/master/lodash.js#L4318 "View in source") [&#x24C9;][1]
 
 *(String)*: The semantic version number.
 
diff --git a/lodash.js b/lodash.js
index a58208a75..5d58a9181 100644
--- a/lodash.js
+++ b/lodash.js
@@ -1184,7 +1184,7 @@
    * // => true
    */
   var isArray = nativeIsArray || function(value) {
-    return toString.call(value) == arrayClass;
+    return value instanceof Array || toString.call(value) == arrayClass;
   };
 
   /**
@@ -1218,7 +1218,7 @@
    * // => true
    */
   function isDate(value) {
-    return toString.call(value) == dateClass;
+    return value instanceof Date || toString.call(value) == dateClass;
   }
 
   /**
@@ -1476,7 +1476,7 @@
   // fallback for older versions of Chrome and Safari
   if (isFunction(/x/)) {
     isFunction = function(value) {
-      return toString.call(value) == funcClass;
+      return value instanceof Function || toString.call(value) == funcClass;
     };
   }
 
@@ -1626,7 +1626,7 @@
    * // => true
    */
   function isRegExp(value) {
-    return toString.call(value) == regexpClass;
+    return value instanceof RegExp || toString.call(value) == regexpClass;
   }
 
   /**
diff --git a/lodash.min.js b/lodash.min.js
index 18ee06b26..caaa89c46 100644
--- a/lodash.min.js
+++ b/lodash.min.js
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diff --git a/lodash.underscore.js b/lodash.underscore.js
index 5cf31e6fd..96757bd74 100644
--- a/lodash.underscore.js
+++ b/lodash.underscore.js
@@ -908,7 +908,7 @@
    * // => true
    */
   var isArray = nativeIsArray || function(value) {
-    return toString.call(value) == arrayClass;
+    return value instanceof Array || toString.call(value) == arrayClass;
   };
 
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@@ -942,7 +942,7 @@
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    */
   function isDate(value) {
-    return toString.call(value) == dateClass;
+    return value instanceof Date || toString.call(value) == dateClass;
   }
 
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   // fallback for older versions of Chrome and Safari
   if (isFunction(/x/)) {
     isFunction = function(value) {
-      return toString.call(value) == funcClass;
+      return value instanceof Function || toString.call(value) == funcClass;
     };
   }
 
@@ -1304,7 +1304,7 @@
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    */
   function isRegExp(value) {
-    return toString.call(value) == regexpClass;
+    return value instanceof RegExp || toString.call(value) == regexpClass;
   }
 
   /**
diff --git a/lodash.underscore.min.js b/lodash.underscore.min.js
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