Redis store key without a value

Question

When using the Redis expire commands like SETEX and TTL, there are scenarios in which there is no need for the key to hold a v

Answer 1

Who said that you should actually store anything in redis key?

Empty string "" is a perfectly valid value for a redis key, and it's a shortest possible one:

> SET foo ""
OK
> GET foo
""
> BITCOUNT foo
(integer) 0