[issue42606] Support POSIX atomicity guarantee of O_APPEND on Windows

[Alexey Izbyshev]

Change by Alexey Izbyshev <izbyshev at ispras.ru>:


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keywords: +patch
pull_requests: +22575
stage:  -> patch review
pull_request: https://github.com/python/cpython/pull/23712

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue42606>
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