[WIP] bpo-38865: Py_FinalizeEx() cannot be called in a subinterpreter by vstinner · Pull Request #19063 · python/cpython
Hum. I had issues while writing PR #19066, but in the pubilished PR, it seems like modifying Py_FinalizeEx() is no longer needed.
I change the PR state to WIP / do-not-merged until I completly understand the issue and ensures that Py_FinalizeEx() behavior must change.