Description:
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ArrayObject does not appear to be serializing the classname of the iterator. When an ArrayObject is deserialized the iterator is always set to the default ArrayIterator class.

Test script:
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<?php

class MyIterator extends ArrayIterator {}

$a = new ArrayObject();
$a->setIteratorClass('MyIterator');
var_dump($a->getIteratorClass());
var_dump($a->serialize());
var_dump(unserialize(serialize($a))->getIteratorClass());