from classes import typeclass

class Meta(type):
    def __instancecheck__(self, other) -> bool:
        return other == 1

class Some(object, metaclass=Meta):
    ...

@typeclass
def some(instance) -> bool:
    ...


@some.instance(Some)
def _some_some(instance: Some) -> bool:
    return True


print(some(1))
# NotImplementedError: Missing matched typeclass instance for type: int

print(some(Some()))
print(some(1))