[issue29464] Specialize FASTCALL for functions with positional-only parameters

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

We can avoid breaking backward compatibility and introduce new call method METH_FASTCALL_NO_KEYWORDS. But combining existing flags looks better to me. FASTCALL is not a part of stable ABI.

I still didn't do any benchmarking or stack usage measurements.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue29464>
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