anchor.diff:  handle_cast(M, #state{delayed = Buffer} = S0) when Buffer =/= false ->
       Fun =
           fun({Opt, {Waiters, Urls}}, S) ->
  -            OldUrls = case S#state.data of
  -                          #tagcontent{urls = U} -> U;
  -                          _ -> []
  -                      end,
  -            do_update(Urls, Opt, Waiters, OldUrls, S)
  +            do_update(Urls, Opt, Waiters, S)
           end,
       NewState =
           lists:foldl(Fun, S0#state{delayed = false}, gb_trees:to_list(Buffer)),
  
positive.code:             Op(TokenPrivilege)
      end.
  
  update({{update, Urls, Token, Opt}, ReplyTo}, OldUrls, S) ->
      Do = fun(_TokenType) -> do_update(Urls, Opt, ReplyTo, OldUrls, S) end,
      authorize(write, Token, ReplyTo, S, Do).
  
  do_update(Urls, Opt, ReplyTo, OldUrls, State) ->
      case ddfs_tag_util:validate_urls(Urls) of
  
negative.code:     gen_server:reply(ReplyTo, {S#state.data, S#state.replicas}),
      {noreply, S, S#state.timeout};
  
  handle_cast({{update, _Urls, _Token, _Opt}, _ReplyTo} = M, S) ->
      S1 = update(M, S),
      {noreply, S1, S1#state.timeout};
  
  handle_cast({{put, Field, Value, Token}, ReplyTo}, S) ->
  