[issue43753] [C API] Add Py_Is(x, y) and Py_IsNone(x) functions

[Raymond Hettinger]

Raymond Hettinger <raymond.hettinger at gmail.com> added the comment:

> Just chiming in to say that for PyPy this API would be extremely useful

Thanks for that input. Given that there would be some value add, I withdraw my objection.

> I proposed to declare it as a "static inline" function,
> but I'm fine with a macro as well.

Let's use a macro then because inlining in guaranteed and we don't have to be on the lookout for failures to inline.

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