[issue40255] Fixing Copy on Writes from reference counting

[Neil Schemenauer]

Neil Schemenauer <nas-python at arctrix.com> added the comment:

I resurrected an old thread on Discourse that seems quite relevant to this PR:

https://discuss.python.org/t/switching-from-refcounting-to-libgc/1641/35?u=nas

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<https://bugs.python.org/issue40255>
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