X-Git-Url: http://git.asbjorn.biz/?a=blobdiff_plain;f=src%2Fcore.js;h=addff6bde760d48b93867cd265474229b22b54d6;hb=4b55e94d0849568a2fd121952f13a9d6571c731f;hp=ff31e813db0f06498a2274fa288949b05b3bd24b;hpb=ef05f44cce870a8b78637b0a88b27087f7f13b37;p=jquery.git

diff --git a/src/core.js b/src/core.js
index ff31e81..addff6b 100644
--- a/src/core.js
+++ b/src/core.js
@@ -39,6 +39,7 @@ var jQuery = function( selector, context ) {
 
 	// Save a reference to some core methods
 	toString = Object.prototype.toString,
+	hasOwnProperty = Object.prototype.hasOwnProperty,
 	push = Array.prototype.push,
 	slice = Array.prototype.slice,
 	indexOf = Array.prototype.indexOf;
@@ -279,7 +280,7 @@ jQuery.extend = jQuery.fn.extend = function() {
 						clone = src;
 					} else if ( jQuery.isArray(copy) ) {
 						clone = [];
-					} else if ( jQuery.isObject(copy) ) {
+					} else if ( jQuery.isObjectLiteral(copy) ) {
 						clone = {};
 					} else {
 						clone = copy;
@@ -322,8 +323,18 @@ jQuery.extend({
 		return toString.call(obj) === "[object Array]";
 	},
 
-	isObject: function( obj ) {
-		return this.constructor.call(obj) === Object;
+	isObjectLiteral: function( obj ) {
+		if ( toString.call(obj) !== "[object Object]" ) {
+			return false;
+		}
+		
+		//own properties are iterated firstly,
+		//so to speed up, we can test last one if it is own or not
+		
+		var key;
+		for ( key in obj ) {}
+		
+		return !key || hasOwnProperty.call( obj, key );
 	},
 
 	isEmptyObject: function( obj ) {