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gh-159437: Count garbage during weakref cleanup - #159598
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pablogsal
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The counting change seems independent of the callback refactor. clear_weakrefs() already walks the final collectable list without running Python, so returning its size doesn't need the new callback helper or list selection. Let's keep this change seperate if that refactor gets reworked.
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With this optimization the GIL collector counts collectable objects during late weakref cleanup. This removes the separate
gc_list_size()walk over the same list.