[issue40630] tracemalloc: allow resetting peak memory metric without touching other traces

[Huon Wilson]

Change by Huon Wilson <wilson.huon at gmail.com>:


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keywords: +patch
pull_requests: +19409
stage:  -> patch review
pull_request: https://github.com/python/cpython/pull/20102

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue40630>
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