[issue40241] [C API] Make PyGC_Head structure opaque, or even move it to the internal C API

[STINNER Victor]

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


New changeset 0c13e1f96a9487e0efe63c3d3a05ff9738bd7dac by Victor Stinner in branch 'master':
bpo-40241: Add pycore_interp.h header (GH-19499)
https://github.com/python/cpython/commit/0c13e1f96a9487e0efe63c3d3a05ff9738bd7dac


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