R. David Murray added the comment: pipe2 can also be used to set O_NONBLOCK, so no, that specific API change wouldn't obsolete pipe2. So, a shim for pipe2 would be the way to go, since that's currently the de-facto standard way of passing flags on pipe creation in unix land. (The os module is usually a thin layer over OS services...for other modules we might design a more divergent API, but generally in the os module we do not.)
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