anchor.diff:      return new _Game((journal != null) ? journal : _newDefaultJournal());
     }
   
  -  Future addActor(Actor actor);
  +  Future<Event> addActor(Actor actor);
   
  -  Future addActors(List<Actor> actors);
  +  Future<List<Event>> addActors(List<Actor> actors);
   
     /// Schedule a new event to be broadcast to all registered listeners. The
     /// event will not be broadcast immediately, but some time after the current
  
positive.code:     }
    }
  
    _addEvent(Event e) {
      e._timeStamp = new DateTime.now();
      _ctrl.add(e);
    }
  }
  
  
negative.code:   ///
    /// Returns a [Future] that completes with the event when it is broadcast to
    /// all listeners.
    Future<Event> broadcast(Event event);
  
    /// Schedule a new event to be broadcast to all registered listeners after
    /// the provided [Duration]. If it is 0 or less, it behaves as [broadcast].
  