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As for how I'd implement the rest of Lua's `math` standard library upon our Lua interpreter bootstrapped upon a risc32cfimv...

`math.abs` could simply be `if x < 0 do return -x else return x end`.

`math.ceil`, `math.floor`, `math.fmod`, & `math.sqrt` have corresponding opcodes from the RISC-V "F" extension, mainly thanks to its rounding-mode flags. And as such would be implemented in Assembly.

`math.deg` & `math.rad` multiplies or divides its argument by pi/180 unit-conversion factor.

1/3?