Fixed and improved jQuery's event system: The target property of the event object is now fixed (IE and Safari), bind() accepts now a third parameter "amount" to run the function only the specified number of times, oneclick etc. uses this new bind - it removes the handler when it is not necessary anymore, therefore providing better performance, see accordion for test/demo ( http://joern.jquery.com/accordion/accordion.html )

src/event/event.js

@@ -1583,8 +1583,8 @@ new function(){
 		var o = e[i];
 		
 		// Handle event binding
-		jQuery.fn[o] = function(f){
-			return f ? this.bind(o, f) : this.trigger(o);
+		jQuery.fn[o] = function(f, amount){
+			return f ? this.bind(o, f, amount) : this.trigger(o);
 		};
 		
 		// Handle event unbinding
@@ -1592,20 +1592,8 @@ new function(){
 		
 		// Finally, handle events that only fire once
 		jQuery.fn["one"+o] = function(f){
-			// Attach the event listener
-			return this.each(function(){
-
-				var count = 0;
-
-				// Add the event
-				jQuery.event.add( this, o, function(e){
-					// If this function has already been executed, stop
-					if ( count++ ) return true;
-				
-					// And execute the bound function
-					return f.apply(this, [e]);
-				});
-			});
+			// use bind with amount param to bind only once
+			return this.bind(o, f, 1);
 		};
 			
 	};