[issue2521] ABC caches should use weak refs

[Daniel Diniz]

Daniel Diniz <ajaksu at gmail.com> added the comment:

Confirmed on release26-maint and trunk.

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nosy: +ajaksu2
priority:  -> normal
stage:  -> test needed
type:  -> resource usage

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