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

[Chris Jerdonek]

Chris Jerdonek <chris.jerdonek at gmail.com> added the comment:

The msg argument has now been added (second PR). I'm going to keep this issue open until the traceback issue has also been addressed (the other PR), as that was one part of the discussions here.

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