anchor.diff:                                    Acc1 = #facc{hacc = AccIn,
                                                  bucket = Bucket,
                                                  acc_fun = Fun},
  -                                  AccOut = mstore:fold(MStore, fun fold_fun/4,
  -                                                       FoldSize, Acc1),
  +                                  AccOut = mstore:fold(MStore, fun fold_fun/4, Acc1),
                                     mstore:close(MStore),
                                     case AccOut of
                                         #facc{lacc=[], hacc=HAcc} ->
  
positive.code:       Time - Last =< ?MAX_DELTA ->
      Delta = Time - Last,
      ThisSize = mmath_bin:length(V),
      AccV = <<AccE/binary, (mmath_bin:empty(Delta))/binary, V/binary>>,
      Acc#facc{
        size = Size + ThisSize + Delta,
        last = Last + Delta + ThisSize,
  
negative.code:       lacc = [{Time, V} | AccL]}.
  
  handle_call({fold, Fun, Acc0}, _From,
              State = #state{partition = Partition}) ->
  
      DataDir = application:get_env(riak_core, platform_data_dir, "data"),
      PartitionDir = [DataDir, $/,  integer_to_list(Partition)],
  