anchor.diff:  
       {ok, #state{actor=Actor,
                   counter=Counter,
  -                sync_counter=0,
                   store=Store,
                   gc_counter=GCCounter}}.
   
  
positive.code:     %% Schedule next synchronization.
      schedule_delta_synchronization(),
  
      {noreply, State#state{sync_counter=SyncCounter+1}};
  handle_info(delta_gc, #state{gc_counter=GCCounter0, store=Store}=State) ->
      log_message_queue_size("delta_gc"),
  
  
negative.code: %% State record.
  -record(state, {store :: store(),
                  actor :: binary(),
                  counter :: non_neg_integer(),
                  gc_counter :: non_neg_integer()}).
  
  