Redis [Feature request] EXISTS return array [0,1] when using an array

While EXISTS is useful to see if something exists, it would be more useful when using an array to return an array to know what keys actually exist or not, a simple [0,1] or [nil,1] would be great.

Comment From: itamarhaber

Hello @gittyup2018

If I understand correctly, you're suggesting a variadic form for EXISTS, i.e: EXISTS <key> [<key> ...]

That's a good idea, but changing EXISTS reply type now would break compatibility. While it may be possible that a new command will be added for that (e.g. MEXISTS), you can use other means for similar results such as a Redis Lua script:

local reply = {}
for _, v in pairs(KEYS) do
  reply.insert(redis.call('EXISTS', v))
end
return reply

```

Comment From: gittyup2018

Ahh right yes, MEXISTS would be a useful addition I believe and thanks for the script work around