Made jQuery.extend(true, ...) to extend recursively only 'object literal' values.

Author: rkatic

src/core.js

@@ -272,19 +272,10 @@ jQuery.extend = jQuery.fn.extend = function() {
 					continue;
 				}
 
-				// Recurse if we're merging object values
-				if ( deep && copy && typeof copy === "object" && !copy.nodeType ) {
-					var clone;
-
-					if ( src ) {
-						clone = src;
-					} else if ( jQuery.isArray(copy) ) {
-						clone = [];
-					} else if ( jQuery.isObjectLiteral(copy) ) {
-						clone = {};
-					} else {
-						clone = copy;
-					}
+				// Recurse if we're merging object literal values
+				if ( deep && copy && jQuery.isObjectLiteral(copy) ) {
+					// Don't extend not object literals
+					var clone = src && jQuery.isObjectLiteral(src) ? src : {};
 
 					// Never move original objects, clone them
 					target[ name ] = jQuery.extend( deep, clone, copy );

test/unit/core.js

@@ -553,16 +553,20 @@ test("jQuery.extend(Object, Object)", function() {
 	same( empty.foo, optionsWithDate.foo, "Dates copy correctly" );
 
 	var myKlass = function() {};
-	var optionsWithCustomObject = { foo: { date: new myKlass } };
+	var customObject = new myKlass();
+	var optionsWithCustomObject = { foo: { date: new customObject } };
 	empty = {};
 	jQuery.extend(true, empty, optionsWithCustomObject);
-	same( empty.foo, optionsWithCustomObject.foo, "Custom objects copy correctly (no methods)" );
+	ok( empty.foo && empty.foo.date && empty.foo.date === customObject, "Custom objects copy correctly (no methods)" );
 
 	// Makes the class a little more realistic
 	myKlass.prototype = { someMethod: function(){} };
 	empty = {};
 	jQuery.extend(true, empty, optionsWithCustomObject);
-	same( empty.foo, optionsWithCustomObject.foo, "Custom objects copy correctly" );
+	ok( empty.foo && empty.foo.date && empty.foo.date === customObject, "Custom objects copy correctly" );
+	
+	var ret = jQuery.extend(true, { foo: 4 }, { foo: new Number(5) } );
+	ok( ret.foo == 5, "Wrapped numbers copy correctly" );
 
 	var nullUndef;
 	nullUndef = jQuery.extend({}, options, { xnumber2: null });