Message 191077 - Python tracker

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> To be exhaustive, another patch should be developed to replace
> all calls for malloc/realloc/free by
> PyMem_Malloc/PyMem_Realloc/PyMem_Free.

I created issue #18203 for this point.

> PyObject_Malloc() is still using mmap() or malloc() internally
> for example.

Arena allocator can be replaced or hooked with PyObject_SetArenaAllocators() of my lastest patch.