SETEX does not throw out of range error on big, but not too big TTL value (Redis 4.0.1)

[Leon Ree, van der]

Hi, I triggered a (strange) bug, in where I set an expire to a somewhat large number: 4200000000000000000, but instead of Redis accepting this number, or throwing an out of range exception, this TTL expires immediately...

127.0.0.1:6379> setex key42 4200000000000000000 value

OK 127.0.0.1:6379> ttl key42 (integer) -2

I would expect:

127.0.0.1:6379> setex key5 5 value

OK 127.0.0.1:6379> ttl key5 (integer) 3 127.0.0.1:6379> ttl key5 (integer) -2

Or:

setex key50 5000000000000000000000 value

(error) ERR value is not an integer or out of range

Or:

setex key not_an_int_2 value

(error) ERR value is not an integer or out of range

I couldn't find anything about this being a known bug (or intended behavior)