message: fixed subscriber leak
diff: @@ -1821,6 +1821,6 @@ class SubscribableImp implements Subscribable {
  this._subscribers = [];
  }
  this._subscribers.push(list);
  - return () => this._subscribers = this._subscribers.filter(x => x != listener);
  + return () => this._subscribers = this._subscribers.filter(x => x != list);
  }
  }
  \ No newline at end of file
  