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Hi, In the past months, several options have been presented for making byval (and similar attributes, such as inalloca or sret) work with opaque pointers. The main two I've seen were byval(T) and byval(N) where N is the size of T. They both have their upsides and downsides, for example: byval(T) would be a type-parametric attribute, which, AFAIK, does not already exist and may complicate