[issue42304] [easy C] long type performance waste in 64-bit Windows build

[Ma Lin]

Ma Lin <malincns at 163.com> added the comment:

> What is the problem exactly?

There are several different problems, such as:
https://github.com/python/cpython/blob/v3.10.0a2/Modules/mathmodule.c#L2033

In addition, `utf16_decode` also has this problem, I forgot this:
https://github.com/python/cpython/blob/v3.10.0a2/Objects/stringlib/codecs.h#L465

Maybe these small problems are suitable for newcomer to familiarize the contribution process.

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<https://bugs.python.org/issue42304>
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