[issue46896] add support for watching writes to selected dictionaries

[Carl Meyer]

Change by Carl Meyer <carl at oddbird.net>:


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keywords: +patch
pull_requests: +29891
stage:  -> patch review
pull_request: https://github.com/python/cpython/pull/31787

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue46896>
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