anchor.diff:                                 Fun =:= zrange_n;
                                  Fun =:= zrangebyscore_n;
                                  Fun =:= zremrangebyrank_n;
  -                               Fun =:= zremrangebyscore_n ->
  +                               Fun =:= zremrangebyscore_n;
  +                               Fun =:= zrevrange_n;
  +                               Fun =:= zrevrangebyscore_n ->
     zadd(Keys),
     ok;
   init_per_round(Fun, Keys) when Fun =:= zinterstore_min ->
  
positive.code:          zinterstore_min/1, zinterstore_n/1, zinterstore_k/1, zinterstore_m/1,
           zrange_n/1, zrange_m/1, zrangebyscore_n/1, zrangebyscore_m/1, zrank/1,
           zrem/1, zrem_one/1, zremrangebyrank_n/1, zremrangebyrank_m/1,
           zremrangebyscore_n/1, zremrangebyscore_m/1]).
  
  %% ====================================================================
  %% External functions
  
negative.code: zrange_n(_Keys) ->
    catch edis_db:run(
      edis_db:process(0),
      #edis_command{cmd = <<"ZRANGE">>, args = [?KEY, -2, -1], group = zsets, result_type = multi_bulk}).
  
  -spec zrange_m([binary()]) -> [binary()].
  zrange_m(_Keys) ->
  