[issue2521] ABC caches should use weak refs
Benjamin Peterson
report at bugs.python.org
Wed Mar 31 02:02:09 CEST 2010
Benjamin Peterson <benjamin at python.org> added the comment:
In those cases, it's because __subclasscheck__ is overridden. You can't register a old-style class.
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nosy: +benjamin.peterson
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<http://bugs.python.org/issue2521>
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