Yes, sorry, I forgot to remove it again. I tried to do what you said, but after thinking more about it, it didn't look usable. As soon as you cluster the event bus, this Map would just give you a wrong impression of being safe. I'll delete it for now, maybe someone comes up with a better idea how to handle this situation. I guess registering handlers with the provided `registerUnregisterableHandler` method would be a lot better than duplicate the whole Java implementation of handler sharing in Scala.