antirez 50c41de752 TTL API change: TTL returns -2 for non existing keys.
The previous behavior was to return -1 if:

1) Existing key but without an expire set.
2) Non existing key.

Now the second case is handled in a different, and TTL will return -2
if the key does not exist at all.

PTTL follows the same behavior as well.
2012-11-12 23:05:56 +01:00
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