[issue29867] Add asserts in PyXXX_GET_SIZE macros

[STINNER Victor]

STINNER Victor added the comment:

We should test to run popular C extensions like numpy, PyQt, cython, pillow, etc. with a patched Python to see if it's common to use a "GET" macro to "set" a size. Maybe test also Django see it probably uses many C extensions. I don't ask to test all these modules, but at least a few of them. By "testing", I mean run the test suite of these projects.

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<http://bugs.python.org/issue29867>
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