gh-141004: document `pyexpat` C API by picnixz · Pull Request #141259 · python/cpython
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The PyExpat capsule is used to access Modules/pyexpat.c functions in Modules/_elementtree.c. I'm not sure that it was intended to be used outside Modules/_elementtree.c.
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In 2020, I moved the Unicode capsule C structure to the internal C API (pycore_ucnhash.h): commit 47e1afd. Then I renamed the PyUnicodeData_CAPSULE_NAME to make it private: commit 84f7382. I expected lot of complains and broken projects, but no one was impacted :-) It went well.