Channel off wrong event

[VanLong-official]

• If I have 2 sites A and B both join the same channel and same event. I disabled the event on site B and wanted to keep that callback on site A but couldn't. When I open the reading library, this function is written as follows:
  /// Removes an event callback
  void off(event, [ref]) {
  _bindings = _bindings
  .where((binding) =>
  binding.event != event && (ref == null || ref == binding.ref))
  .toList();
  }
  I thing the right code must be:
  /// Removes an event callback
  /// Keep difference event or event with difference ref
  void off(event, [ref]) {
  _bindings = _bindings
  .where((binding) =>
  binding.event != event || ![binding.ref, null].contains(ref))
  .toList();
  }