[issue37842] Initialize Py_buffer variables more efficiently

[Sergey Fedoseev]

Change by Sergey Fedoseev <fedoseev.sergey at gmail.com>:


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keywords: +patch
pull_requests: +14975
stage:  -> patch review
pull_request: https://github.com/python/cpython/pull/15254

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue37842>
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