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Thu Sep 8 12:39:10 EDT 2016 · https://mail.python.org/pipermail/python-dev/2016-September/146318.html

On Thu, Sep 8, 2016, at 12:30, Chris Barker wrote:
> That's why I said "based on" -- under the hood, a C type is used, and
> IIUC, that type has been "long" for ages. And a long on Windows 64
> (with the MS compiler anyway) is 32 bit, and a long on *nix (with the
> gnu compilers, at least) is 64 bits.
>
> This doesn't expose itself to pure python (and sys.maxint is now gone)
> but it does get exposed in the C API, and in particular, when passing
> data back and forth between numpy and pure python (numpy doesn't
> support an unlimited integer like python), or working with buffers or
> bytearrays, or whatever in Cython.

I'm not sure "the builtin integer type" was the right term for what
you're referring to.

You're talking about changing Py_ssize_t, right?

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[Python-Dev] (some) C99 added to PEP 7