[issue45276] avoid try 1000 in asyncio all_tasks by making weak collection .copy() atomic

[Thomas Grainger]

Change by Thomas Grainger <tagrain at gmail.com>:


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keywords: +patch
pull_requests: +26925
stage:  -> patch review
pull_request: https://github.com/python/cpython/pull/28541

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue45276>
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