anchor.diff:    }
   }
   
  -class Event {
  +class ScopeEvent {
     String name;
     Scope targetScope;
     Scope currentScope;
     bool propagationStopped = false;
     bool defaultPrevented = false;
   
  -  Event(this.name, this.targetScope);
  +  ScopeEvent(this.name, this.targetScope);
   
     stopPropagation () => propagationStopped = true;
     preventDefault() => defaultPrevented = true;
  
positive.code:     var target = this,
          current = target,
          next = target,
          event = new Event(name, this);
  
      //down while you can, then up and next sibling or up and next sibling until back at root
      if (listenerArgs == null) {
  
negative.code:     var empty = [],
          namedListeners,
          scope = this,
          event = new ScopeEvent(name, this),
          listenerArgs = [event],
          i;
  
  