Just to add -- sometimes I use Redis when I don't have a trusted impl of HyperLogLog or sorted set (and I have a vague suspicion that I am going to do IPC later

Just to add -- sometimes I use Redis when I don't have a trusted impl of HyperLogLog or sorted set (and I have a vague suspicion that I am going to do IPC later -- so not worth it to wrap my own HLL).