anchor.diff:  do_read(Bucket, Metric, Time, Count, State = #state{})
     when is_binary(Bucket), is_binary(Metric), is_integer(Count) ->
       case get_set(Bucket, State) of
  -        {ok, {{_LastWritten, _Resolution, MSet}, S2}} ->
  +        {ok, {{_LastWritten, MSet}, S2}} ->
               {ok, Data} = mstore:get(MSet, Metric, Time, Count),
               {Data, S2};
           _ ->
  
positive.code: -spec do_write(binary(), binary(), pos_integer(), binary(), state()) ->
                        state().
  do_write(Bucket, Metric, Time, Value, State) ->
      {{_, R, MSet}, State1} = get_or_create_set(Bucket, State),
      MSet1 = mstore:put(MSet, Metric, Time, Value),
      LastWritten = erlang:system_time(),
      Store1 = gb_trees:enter(Bucket, {LastWritten, R, MSet1},
                              State1#state.mstores),
      State1#state{mstores = Store1}.
  
  do_read_bitmap(Bucket, Metric, Time, State) ->
      case get_set(Bucket, State) of
          {ok, {{_LastWritten, _Resolution, MSet}, S2}} ->
              R = mstore:bitmap(MSet, Metric, Time),
              {R, S2};
          _ ->
  
negative.code:     Dc;
  compress(Data, #state{compression = none}) ->
      Data.
  