> [...] but I am not sure it makes sense to allow to mark an object as finalized because that could mess with the GC algorithm.

Actually, I would like the opposite, to mark it unfinalized to resurrect the object more than once. PEP 442 from a ways back had this effect (per bpo-32377), and Antoine updated the docs after I filed the issue.

I didn't chime in early enough to snag the "more-than-once" functionality, so I guess this is what I get for dipping into private API without asking to make it public until 2 years later... d'oh!