[issue15142] Fix reference leak with types created using PyType_FromSpec

[Nick Coghlan]

Nick Coghlan <ncoghlan at gmail.com> added the comment:

True, I didn't follow the bouncing ball far enough. In that, case I think all that is needed is a comment like:

"subtype_dealloc walks the MRO to call the base dealloc function, so it is OK to block inheritance of the slot"

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue15142>
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