[issue40120] Undefined C behavior going beyond end of struct via a char[1].

[STINNER Victor]

STINNER Victor <vstinner at python.org> added the comment:

> Currently, C++ code that includes `<Python.h>` is warning-free in GCC (g++) even with `-Wpedantic`. That won't be true after this change, unless Py_LIMITED_API is defined.

By the way, the current trend is to make more and more structures opaque in the C API. See for example:

* bpo-39573: Make PyObject an opaque structure in the limited C API
* bpo-39947: Make the PyThreadState structure opaque (move it to the internal C API)

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<https://bugs.python.org/issue40120>
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