anchor.diff:      {Elements, RestInterval} = intervals:get_elements(Interval),
       case intervals:is_empty(RestInterval) of
           true ->
  -            [E || Key <- Elements, E <- [get_entry(State, Key)], not db_entry:is_empty(E)];
  +            [E || Key <- Elements, not db_entry:is_empty(E = get_entry(State, Key))];
           _ ->
               {_, Data} =
                   get_chunk(State, ?RT:hash_key("0"), % any key will work, here!
                              Interval,
  -                           fun(DBEntry) ->
  -                                   (not db_entry:is_empty(DBEntry)) andalso
  -                                       intervals:in(db_entry:get_key(DBEntry), Interval)
  -                           end,
  +                           fun(DBEntry) -> not db_entry:is_empty(DBEntry) end,
                              fun(E) -> E end, all),
               Data
       end.
  
positive.code:               TargetLoad + 1),
      normalize_split_key_b(Split, TargetLoad, End).
  
  normalize_split_key_b({Key, TakenLoad}, TargetLoad, End) when TakenLoad >
          TargetLoad ->
      normalize_split_key({Key, TakenLoad - 1}, TargetLoad, End);
  normalize_split_key_b({_Key, TakenLoad}, TargetLoad, End) when TakenLoad == TargetLoad ->
      normalize_split_key({End, TakenLoad}, TargetLoad, End);
  normalize_split_key_b(Split, TargetLoad, End) ->
  normalize_split_key(Split, TargetLoad, End).
  normalize_split_key({Key, TakenLoad}, TargetLoad, End) ->
      case TakenLoad < TargetLoad of
          true ->
              {End, TakenLoad};
          _ ->
              {Key, TakenLoad}
      end.
  
  %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
  %% Snapshot-related functions
  
negative.code: %%      matching.
  -spec call_subscribers(State::db(), Operation::close_db | subscr_op_t()) -> db().
  call_subscribers(State = {_DB, Subscr, _SnapState}, Operation) ->
      {NewState, _Op} = ?DB:foldl(Subscr,
                fun call_subscribers_iter/2,
                {State, Operation}),
      NewState.
  