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Beyond `&`/`&mut`/`Box`, this covers `char`, discriminants, `NonZero*`, etc. All such types currently cause a Miri error if left uninitialized, and an `invalid_value` lint in cases like `mem::uninitialized::<char>()` Note that this _does not_ change whether or not it is UB for `u64` (or other integer types with no invalid values) to be undef.