The akka.zeromq.Unsubscribe option shall remove an existing message filter
on a akka.zeromq.SocketType.Sub socket. The filter specified must match an existing filter
previously established with the akka.zeromq.Subscribe option. If the socket has several instances of the
same filter attached the akka.zeromq.Unsubscribe option shall remove only one instance, leaving the rest
in place and functional.
The akka.zeromq.Unsubscribe option shall remove an existing message filter on a akka.zeromq.SocketType.Sub socket. The filter specified must match an existing filter previously established with the akka.zeromq.Subscribe option. If the socket has several instances of the same filter attached the akka.zeromq.Unsubscribe option shall remove only one instance, leaving the rest in place and functional.