> currently the TTL command returns -1 on non existing key, and also in
> the case no expire time is set on the key at all.

> Starting with Redis 2.8 I would like to change the behavior into the
> following:

> Key without TTL -> -1
> Non existing key TTL -> -2

> I don't think this is going to break a lot of code at all, but I
> wonder what you think. This API makes sense as to have the old
> behavior you need just:

> if ttl(key) < 0, instead of explicitly checking for -1

> Instead in order to distinguish the two other different cases, just
> check for the proper value, that your client library could declare as
> constants for simplicity.

> About the sequence -1 and -2, the rationale is that -1 no TTL and -2
> no key at all is in accordance with the fact that -2 feels "more
> negative" than -1, so it is easy to remember.

> Cheers,
> Salvatore

> --
> Salvatore 'antirez' Sanfilippo
> open source developer - VMware
> http://invece.org

> Beauty is more important in computing than anywhere else in technology
> because software is so complicated. Beauty is the ultimate defence
> against complexity.
>        — David Gelernter

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