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Thanks for the feedback!
Attaching a new patch which implements tp_free_list slot as suggested -
I hope I did it correctly. I've only implemented the new slot for dict
so far, but I'm happy to tp_free_list-ify the other freelist types as
well, in a future patch, if this gets the green light.
Description of the patch:
* added tp_free_list slot to PyTypeObject (definitely for review: is the
location of tp_free_list right after tp_free sensible?)
* added PyType_ClearFreeList(PyTypeObject *) to C API, which calls the
tp_free_list function if not NULL
* inserted the new slot where necessary (e.g. in PyGen_Type) to sync
type definitions with the updated PyTypeObject
* created dict_free_list function and added it to PyDict_Type
* call PyType_ClearFreeList(&PyDict_Type) from gc.collect()