[issue19270] Document that sched.cancel() doesn't distinguish equal events and can break order

[Jonas Norling]

Jonas Norling <jonas.norling at greeneggs.se> added the comment:

@bar.harel: I didn't find a PR, so I'd like to encourage you to submit one :-)

I stumbled onto this bug when the scheduler would cancel the wrong event for me (Python 3.7, 3.8). Raymond's suggestion 1 sounds reasonable; it would be very unlikely to break code that doesn't depend on internals in sched, and it simplifies the implementation a bit.

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nosy: +wocket

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<https://bugs.python.org/issue19270>
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