Ensure isType methods return false for subclassed values.

Former-commit-id: e300d12eb506c6ae4949bd37cf8eb33c3a4be2e1

lodash.js

@@ -943,6 +943,26 @@
       };
     }
 
+    /**
+     * 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 value && typeof value == 'object' && toString.call(value) == arrayClass;
+    };
+
     /**
      * A fallback implementation of `Object.keys` which produces an array of the
      * given object's own enumerable property names.
@@ -1416,29 +1436,6 @@
       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
-     */
-    function isArray(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) ||
-        (nativeIsArray ? nativeIsArray(value) : toString.call(value) == arrayClass);
-    }
-
     /**
      * Checks if `value` is a boolean value.
      *
@@ -1470,7 +1467,7 @@
      * // => true
      */
     function isDate(value) {
-      return value instanceof Date || toString.call(value) == dateClass;
+      return value ? typeof value == 'object' && toString.call(value) == dateClass : false;
     }
 
     /**
@@ -1774,7 +1771,7 @@
     // fallback for older versions of Chrome and Safari
     if (isFunction(/x/)) {
       isFunction = function(value) {
-        return value instanceof Function || toString.call(value) == funcClass;
+        return typeof value == 'function' && toString.call(value) == funcClass;
       };
     }
 
@@ -1924,7 +1921,7 @@
      * // => true
      */
     function isRegExp(value) {
-      return value instanceof RegExp || toString.call(value) == regexpClass;
+      return value ? typeof value == 'object' && toString.call(value) == regexpClass : false;
     }
 
     /**