[issue31368] Support asynchronous, non-blocking buffered reads (RWF_NONBLOCK)

[STINNER Victor]

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

I set the priority to release blocker to make sure that I don't forget to merge the PR before Python 3.7b1 (next monday?). The PR is *almost* ready, remaining issues are mostly related to documentation and coding style.

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priority: normal -> release blocker

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