I will also say that I don't believe the safe-navigation operators necessarily compromise type safety. PEP 505 explicitly rejects having them catch `AttributeError` or `KeyError` (and I agree with this rejection). It's not the default behavior of objects to return None when an unknown attribute is read, so attempting to access `book?.publisher?.onwer?.name` will still fail with `AttributeError`. Type checkers would also continue being able to check such navigation.
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