Make _.isArray consistent with the other isType methods.

Former-commit-id: adcf242ba7692c96fb8f570118acd7fd0a4602da

dist/lodash.underscore.js

@@ -483,28 +483,6 @@
     };
   }
 
-  /**
-   * Checks if `value` is an array.
-   *
-   * @static
-   * @memberOf _
-   * @category Objects
-   * @param {Mixed} value The value to check.
-   * @returns {Boolean} Returns `true`, if the `value` is an array, else `false`.
-   * @example
-   *
-   * (function() { return _.isArray(arguments); })();
-   * // => false
-   *
-   * _.isArray([1, 2, 3]);
-   * // => true
-   */
-  var isArray = nativeIsArray || function(value) {
-    // `instanceof` may cause a memory leak in IE 7 if `value` is a host object
-    // http://ajaxian.com/archives/working-aroung-the-instanceof-memory-leak
-    return (support.argsObject && value instanceof Array) || toString.call(value) == arrayClass;
-  };
-
   /**
    * A fallback implementation of `Object.keys` which produces an array of the
    * given object's own enumerable property names.
@@ -842,6 +820,26 @@
     return result;
   }
 
+  /**
+   * Checks if `value` is an array.
+   *
+   * @static
+   * @memberOf _
+   * @category Objects
+   * @param {Mixed} value The value to check.
+   * @returns {Boolean} Returns `true`, if the `value` is an array, else `false`.
+   * @example
+   *
+   * (function() { return _.isArray(arguments); })();
+   * // => false
+   *
+   * _.isArray([1, 2, 3]);
+   * // => true
+   */
+  var isArray = nativeIsArray || function(value) {
+    return toString.call(value) == arrayClass;
+  };
+
   /**
    * Checks if `value` is a boolean value.
    *
@@ -873,7 +871,7 @@
    * // => true
    */
   function isDate(value) {
-    return value instanceof Date || toString.call(value) == dateClass;
+    return toString.call(value) == dateClass;
   }
 
   /**
@@ -1118,7 +1116,7 @@
   // fallback for older versions of Chrome and Safari
   if (isFunction(/x/)) {
     isFunction = function(value) {
-      return value instanceof Function || toString.call(value) == funcClass;
+      return toString.call(value) == funcClass;
     };
   }
 
@@ -1232,7 +1230,7 @@
    * // => true
    */
   function isRegExp(value) {
-    return value instanceof RegExp || toString.call(value) == regexpClass;
+    return toString.call(value) == regexpClass;
   }
 
   /**