[TYPO3-core] RFC: No-brainer #15196: Speedup t3lib_cache_backend_DbBackend::has($entryIdentifier)

[Christian Kuhn]

Steffen Kamper wrote:
> better to add a comment instead making code misleading.

I'd go with Oliver in this case: There is no enforced restriction for 
identifier to be unique, so I've chosen ">=". Better safe than sorry ;)

Committed attached v4 to:
* trunk rev. 8278
* 4.4 rev. 8279
* 4.3 rev. 8280

Thanks
Christian
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