uJS: listening to C# delegate events with function parameters

Hey there,

I'm trying to follow the tutorial on events. I created an EventManager in C# like that in the tutorial:

 public class EventManager : MonoBehaviour {
 
     public delegate void tutorial_check_step(int step);
     public static event tutorial_check_step on_tutorial_check;
 
      void OnGUI() {
         if(GUI.Button(new Rect(Screen.width / 2 - 50, 5, 100, 30), "Click"))  {
             if(on_tutorial_check != null)
                 on_tutorial_check(0);
         }
     } 
 }

Now I'm trying to listen to the events with uJS - and it works fine with a function without any parameters. However with parameters I fail to find the correct syntax:

 function OnEnable() {
     EventManager.on_tutorial_check += check_test;
 }
 
 public function check_test(step:int):void {
     Debug.Log("finished step"+step);
 }

compiler throws:

 The event 'EventManager.on_tutorial_check_step' expects a function reference compatible with 'function(): void'.