Message 378353 - Python tracker

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This behavior (only relevant with `from __future__ import annotations`) has been around since @singledispatchmethod was introduced in 3.8, so I agree we should treat it as a feature request.

In the meantime, maybe a workaround is to move the register call out of the class? It looks a little bit ugly but probably works.

(Disclaimer: I'm not familiar with singledispatchmethod.)