[issue19270] sched.cancel() breaks events order

[Raymond Hettinger]

Raymond Hettinger added the comment:

This module has been around for a long time and no users have reported any issues with respect to event ordering.  The logic is essentially the same as is used in popular event loops like Tornado.

Please don't just make-up a new invariant for this module.

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versions:  -Python 2.7, Python 3.3

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