anchor.diff:              {noreply, State0};
           _ ->
               %% Perform join.
  -            State = internal_join(Node, State0),
  +            State = internal_join(Node, undefined, State0),
   
               %% Return.
               {noreply, State}
  
positive.code:             {reply, ok, State0};
          _ ->
              %% Perform join.
              State = sync_internal_join(Node, From, State0),
  
              %% Return.
              {noreply, State}
  
negative.code: 
  %% @private
  internal_join(#{name := Name} = Node,
                From,
                #state{pending=Pending0,
                       sync_joins=SyncJoins0,
  