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After doing some analysis of the errors found when running the tests in php 8.1 I made some changes to respect the strict types that are now required as return in SplDoublyLinkedList
I'm using integers instead of strings for keys in linked lists.
It is only necessary to convert the keys in the case of using them directly as in marc_list_001.phpt.
Also fixed some issues with parameters sent to the preg_match method.