Scalar.Maybe_naked
type ('a, 'b) t =
| Value of 'a
| Naked of 'b
"Naked" means either untagged or unboxed, depending whether the type fits in 31 bits or not. e.g., Naked Int8 is untagged, but Naked (Int32 Any_locality_mode) would be unboxed
Naked Int8
Naked (Int32 Any_locality_mode)