anchor.diff:  log_message_queue_size(Method) ->
       {message_queue_len, MessageQueueLen} = process_info(self(), message_queue_len),
       lasp_logger:mailbox("MAILBOX " ++ Method ++ " message processed; messages remaining: ~p", [MessageQueueLen]).
  +
  +%% @private
  +without_me(Members) ->
  +    Members -- [node()].
  
positive.code: -spec handle_cast(term(), #state{}) -> {noreply, #state{}}.
  %% Anti-entropy mechanism for causal consistency of delta-CRDT;
  %% periodically ship delta-interval or entire state.
  handle_cast({delta_exchange, Peer}, #state{store=Store, gc_counter=GCCounter}=State) ->
      log_message_queue_size("delta_exchange"),
  
      lasp_logger:extended("Exchange starting for ~p", [Peer]),
  
negative.code: 
  %% @private
  init_delta_sync(Peer) ->
      init_delta_sync(Peer, fun(_) -> true end).
  
  init_delta_sync(Peer, ObjectFilterFun) ->
      gen_server:cast(?MODULE, {delta_exchange, Peer, ObjectFilterFun}).
  
  %% @private
  membership() ->
  