[issue33521] Add 1.32x faster C implementation of asyncio.isfuture().

[STINNER Victor]

STINNER Victor <vstinner at redhat.com> added the comment:

About the benchmark: you should not loop inside the function. I propose a variant of the benchmark: isfuture_benchmark2.py.

Jimmy: Would you mind to run this variant on your PR?

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Added file: https://bugs.python.org/file47603/isfuture_benchmark2.py

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