[issue32622] Implement loop.sendfile

[STINNER Victor]

STINNER Victor <victor.stinner at gmail.com> added the comment:

ProactorEventLoopTests.test_sendfile_close_peer_in_middle_of_receiving() leaks a reference on Windows: bpo-32710.

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue32622>
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