bpo-36974: document PEP 590 by jdemeyer · Pull Request #13450

Merged

Don't document our plans for the functions, but rather the
expectations for their users.

…_NARGS

This is not described in detail in PEP 590;
see python#13699
for the practical issue.

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bpo-36974: document PEP 590 by jdemeyer · Pull Request #13450 · python/cpython