[issue2521] ABC caches should use weak refs

[Daniel Stutzbach]

Daniel Stutzbach <daniel at stutzbachenterprises.com> added the comment:

Antoine, do you have a suggestion for someone with with better knowledge of ABCs to do the final review, so that I may very politely pester them? ;-)

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue2521>
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