[issue30064] BaseSelectorEventLoop.sock_{recv, sendall}() don't remove their callbacks when canceled

[Fantix King]

Change by Fantix King <fantix.king at gmail.com>:


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pull_requests: +19743
pull_request: https://github.com/python/cpython/pull/20494

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue30064>
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