anchor.diff:  %% Sends to all providers information to skip the sequence numbers.
   %% @end
   %%--------------------------------------------------------------------
  --spec ignore_all(Seqs :: ordsets:ordset()) -> no_return().
  +-spec ignore_all(Seqs :: ordsets:ordset(seq())) -> no_return().
   ignore_all(Seqs) ->
       Subscriptions = subscriptions:all(),
       lists:foreach(fun(#document{value = Subscription}) ->
  
positive.code: %% @end
  %%--------------------------------------------------------------------
  
  -spec fetch_from_cache(Seqs :: ordsets:ordset()) -> no_return().
  fetch_from_cache(Seqs) ->
      {Hits, Misses} = changes_cache:query(Seqs),
      lists:foreach(fun({Seq, {Doc, Type}}) ->
  
negative.code: %% @end
  %%--------------------------------------------------------------------
  
  -spec fetch_from_db(Seqs :: ordsets:ordset(seq())) -> no_return().
  fetch_from_db([]) -> ok;
  fetch_from_db(Seqs) ->
      From = hd(Seqs) - 1,
  