Bug #52782: DOMDocument subclass forgotten using ->ownerDocumentafter closure

(I filed bug #52782 about a month ago, but have not received any reply.
I am posting here to try and get some feedback on it.)

We have custom XML document and element classes that extend the original
DOMDocument and DOMElement classes for convenience. There is a class
that uses an instance of XmlElement obtained via a callback specified at
construction time. That XmlElement works fine and stays that way.
However, when we get its ownerDocument outside of the closure, the
result is not an XmlDocument but a DOMDocument. I cannot see a single
reason why.

I tried several options, and it only seems to happen with that closure.
I have checked versions 5.3.1, 5.3.2, 5.3.3 and now the latest 5.3.4
snapshot compiled with './configure && make'.

More details and a test case: http://bugs.php.net/bug.php?id=52782

Jan

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