[TYPO3-core] FYI72: Bug #15393: [Caching framework] API usage: Make sure lifetime is NULL or integer

[Christian Kuhn]

The following patch will be committed in 72 hours if nobody objects:

Type: Bug

Branches: trunk, 4.4, 4.3

BT: http://bugs.typo3.org/view.php?id=15393

Problem:
The set() API of cache frontends expects lifetime to be either NULL or 
an integer. This is not always the case in core: If the lifetime comes 
from TS settings its type is string.

Solution:
intval() lifetimes.

Regards
Christian
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