[issue43725] Create a release branch ABI stability regression test

[Steve Dower]

Steve Dower <steve.dower at python.org> added the comment:

I got a false positive on my PR at https://github.com/python/cpython/pull/25318/checks?check_run_id=2308871807

1 Changed variable:

  [C]'const unsigned char[45154] const _Py_M__importlib_bootstrap_external' was changed to 'const unsigned char[43681] const _Py_M__importlib_bootstrap_external' at importlib_external.h:2:1:
    size of symbol changed from 45154 to 43681
    type of variable changed:
     'const unsigned char[45154] const' changed to 'const unsigned char[43681] const'


Is there an option to exclude array lengths? Or to treat the API as just a pointer rather than an array?

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