[issue31033] Add argument to .cancel() of Task and Future

[Chris Jerdonek]

Change by Chris Jerdonek <chris.jerdonek at gmail.com>:


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keywords: +patch
pull_requests: +19267
stage:  -> patch review
pull_request: https://github.com/python/cpython/pull/19951

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue31033>
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