Dmitry Kulazhenko added the comment:
Based on what I've read, workaround:
from functools import singledispatchmethod
def _register(self, cls, method=None):
if hasattr(cls, "__func__"):
setattr(cls, "__annotations__", cls.__func__.__annotations__)
return self.dispatcher.register(cls, func=method)
singledispatchmethod.register = _register
--
nosy: +dmkulazhenko -EugenePY, FFY00, Viktor Roytman, glyph, levkivskyi,
lukasz.langa, markgrandi, mental, ncoghlan, xtreak
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<https://bugs.python.org/issue39679>
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