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<?php var_dump(unserialize('C:19:"SplDoublyLinkedList":4:{i:0;}'));
Output for git.master, git.master_jit, rfc.property-hooks
object(SplDoublyLinkedList)#1 (2) { ["flags":"SplDoublyLinkedList":private]=> int(0) ["dllist":"SplDoublyLinkedList":private]=> array(0) { } }

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