[issue40255] Fixing Copy on Writes from reference counting

[Carl Meyer]

Carl Meyer <carl at oddbird.net> added the comment:

> An immortalized object will never start participating in reference counting again after it is immortalized.

Well, "passed to an extension compiled with no-immortal headers" is an exception to this.

But for the "not GC tracked but later becomes GC tracked" case, it will not re-enter reference counting, only the GC.

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue40255>
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