anchor.diff:      ReadIdx = read_idx(File),
       case ReadIdx of
           {O, S, Idx, Next} when Offset =:= O,
  -                         Size =:= S ->
  +                               Size =:= S ->
               case file:open(File ++ ".mstore", FileOpts) of
                   {ok, F} ->
                       MF = #mfile{index=Idx, name=File, file=F, offset=Offset,
  
positive.code: 
  %%--------------------------------------------------------------------
  %% @doc
  %% 
  %% @end
  %%--------------------------------------------------------------------
  -spec fold(file:filename_all() | mfile(), pos_integer(), fold_fun(), pos_integer(), term()) -> term().
  
negative.code: 
  %%--------------------------------------------------------------------
  %% @doc
  %%
  %% @end
  %%--------------------------------------------------------------------
  -spec write(mfile(), pos_integer(), binary(), non_neg_integer(), binary()) ->
  