[issue19876] selectors (and asyncio?): document behaviour on closed files/sockets

[Guido van Rossum]

Guido van Rossum added the comment:

I think we should give the reader some kind of hint, since a bug in this area may cause a lot of pain when it has to be debugged on porting from a system where the issue is silent to one where it causes a crash.  These docs (unlike a PEP) are not a formal standard but documentation for users.  Maybe we can add a separate section of caveats?

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