I recommend against using primitive type for anything at all, cf eg https://github.com/JuliaLang/julia/issues/29193, https://github.com/JuliaLang/julia/issues/29053, https://github.com/JuliaLang/julia/issues/26026, https://discourse.julialang.org/t/odd-byte-length-primitive-types-and-reinterpret/9025/3.
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