Allan Feldman <allan.d.feld...@gmail.com> added the comment:

Also I just noticed this statement:

> In current CPython, for your ForeverObject(False), `del o` does not make the 
> object trash "for real".  __del__ runs immediately (due to deterministic, 
> synchronous reference counting) and resurrects it.  That cuts off the "about 
> to have its memory destroyed and recycled" part, so the callback doesn't run.

The problem is the callback _does_ run even though the object is resurrected! :)

(Only if going through gc)

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<https://bugs.python.org/issue40312>
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