[TYPO3-core] CachingFramework Backens without experiation with tags

[Georg Ringer]

Hi,

I stumbled over the issue that no implementation of a CF-Backend uses
the expiration if saving tags.

e.g. ApcBackend
The method set() calls
---------
$success = apc_store($this->getIdentifierPrefix() . $entryIdentifier,
$data, $expiration);
---------

but it also calls then
--------
$this->addIdentifierToTags($entryIdentifier, $tags);
--------

The same for other Backends.

Is there a reason for it?

Thanks
Georg