[issue39573] [C API] Make PyObject an opaque structure in the limited C API

[STINNER Victor]

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

> bpo-39573: Convert Py_TYPE() to a static inline function (GH-20290)

This change broke two projects:

* Cython: https://github.com/cython/cython/commit/d8e93b332fe7d15459433ea74cd29178c03186bd (FIXED)
* immutables: https://github.com/MagicStack/immutables/issues/46

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