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@whitequark @jfbastien Yeah and I am very much im favor of making the C++ standard reflect the realities of the 99.99% of hardware everyone actually uses and not UB things because some architecture from the 1970s does it differently.

For example defining that sizeof(&P) == sizeof(&Q) for any P and Q. And allowing printf(%p) to be used directly on any pointer type as a consequence.

Make the actual size implementation defined, by all means. As long as it's the same for any two pointer types.