anchor.diff:  %%   as {@link eid/1} with the argument estore.
   %% @end
   %%--------------------------------------------------------------------
  +-spec eid() -> <<_:32>>.
   eid() ->
       eid(estore).
   
  
positive.code: %%    a ballpark of how many entries exist.
  %% @end
  %%--------------------------------------------------------------------
  
  count(EStore) ->
      Files = files(EStore),
      Res = lists:foldl(fun (File, AccIn) ->
  
negative.code: %% in there.
  %% @end
  %%--------------------------------------------------------------------
  -spec delete(non_neg_integer(), estore()) ->
                      {ok, estore()}.
  delete(Before, EStore = #estore{size = Size})
    when is_integer(Before),
         Before >= 0 ->
      EStore1 = close_file(EStore),
      %% We substract the Size from Before so we can make sure that we
      %% can guarantee everything after Before is still there.
  