mcgrathr added a comment. The motivating use case always pairs `noderef` with an `address_space` attribute, and it's already invalid to convert between pointer types in different address spaces without a cast. So I don't think we have a strong opinion one way or the other. In the abstract, I'd say `noderef` feels like a "constraining" qualifier a la const/volatile so that going from unconstrained to constrained implicitly is OK but not vice versa.
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