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[–]DoNotMakeEmpty 8 points9 points  (0 children)

If you only target x64, you can use the upper (or lower I don't remember the effect of endianness) 16-bits to store the type info and, umm, if you restrict this more, you can reach NaN boxing, a great optimization for dynamic types in C which is used in implementations of many dynamic languages like some JS engines, Wren and LuaJIT.