Fix GH-17409: Assertion failure Zend/zend_hash.c:1730 #17421
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The array merging function may still hold the properties array while the object is already being destroyed. Therefore, we should take into account the refcount in simplexml's destruction code. It may be possible to trigger this in other ways too.
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The array merging function may still hold the properties array while the object is already being destroyed. Therefore, we should take into account the refcount in simplexml's destruction code. It may be possible to trigger this in other ways too.