Utils updated.

lib/utils.js

@@ -303,52 +303,38 @@ Cola.Dictionary.prototype = {
 };
 
 Cola.clone = function (item) {
-    if (!item) { return item; } // null, undefined values check
+    if (item === undefined || item === null) return item;
 
-    var types = [ Number, String, Boolean ], 
-        result;
+    var result, types = [ Number, String, Boolean ];
 
-    // normalizing primitives if someone did new String('aaa'), or new Number('444');
-    types.forEach(function(type) {
-        if (item instanceof type) {
-            result = type( item );
-        }
-    });
+    for (var i in types) 
+        if(types.hasOwnProperty(i) && item instanceof types[i])
+            return type( item );
 
-    if (typeof result == "undefined") {
-        if (Object.prototype.toString.call( item ) === "[object Array]") {
-            result = [];
-            item.forEach(function(child, index, array) { 
-                result[index] = Cola.clone( child );
-            });
-        } else if (typeof item == "object") {
-            // testing that this is DOM
-            if (item.nodeType && typeof item.cloneNode == "function") {
-                var result = item.cloneNode( true );    
-            } else if (!item.prototype) { // check that this is a literal
-                if (item instanceof Date) {
-                    result = new Date(item);
-                } else {
-                    // it is an object literal
-                    result = {};
-                    for (var i in item) {
-                        result[i] = Cola.clone( item[i] );
-                    }
-                }
-            } else {
-                // depending what you would like here,
-                // just keep the reference, or create new object
-                if (false && item.constructor) {
-                    // would not advice to do that, reason? Read below
-                    result = new item.constructor();
-                } else {
-                    result = item;
-                }
-            }
-        } else {
-            result = item;
-        }
+    if (item.__proto__ === Array.prototype) {
+        result = [];
+        item.forEach(function(child, index, array) { 
+            result[index] = Cola.clone( child );
+        });
+
+        return result;
+    } 
+
+    if (!(item instanceof Object)) return item;
+       
+    if (item.nodeType && item.cloneNode instanceof Function) return item.cloneNode( true );    
+        
+    if (!item.prototype) {
+        if (item instanceof Date) return new Date(item);
+        if (item instanceof Function) return item;
+        if (item.clone instanceof Function) return item.clone();
+        
+        result = {};
+        for (var i in item) result[i] = Cola.clone( item[i] );
+        result.__proto__ = item.__proto__;
+
+        return result;
     }
 
-    return result;
+    return item;
 };