[TYPO3-core] RFC: 15211: listQuery does not handle passed in int values correctly

[Bjoern Pedersen]

Bug tracker reference: http://bugs.typo3.org/view.php?id=15211

the page group access check calls t3lib_db with an int array (obtained
by t3lib_div::intExplode).

if the group number matches ord(',') strpos(',', value) returns a match
causing an ValueErrorException.

Solution: check  that $value is a string, otherwise convert it with strval.


Note: The  bugtracker contains two tests showing the strange strpos
behaviour.
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