Merge pull request #3489 from jridgewell/trigger-for-slice

Use for-loop, instead of slice

backbone.js

@@ -277,7 +277,10 @@
   // receive the true name of the event as the first argument).
   Events.trigger =  function(name) {
     if (!this._events) return this;
-    var args = slice.call(arguments, 1);
+    
+    var length = Math.max(0, arguments.length - 1);
+    var args = Array(length);
+    for (var i = 0; i < length; i++) args[i] = arguments[i + 1];
 
     eventsApi(triggerApi, this, name, void 0, args);
     return this;