Overridden finalizer which will try to stop the actor once this Inbox is no longer referenced.
Obtain a reference to the internal actor, which can then for example be registered with the event stream or whatever else you may want to do with an ActorRef.
Receive a single message from the internal
Receive a single message for which the given partial function is defined
and return the transformed result, using the internal
Have the internal actor act as the sender of the given message which will be sent to the given target.
Make the inbox’s actor watch the target actor such that reception of the Terminated message can then be awaited.