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How does this scheme of yours work with m/s and seconds.

IIUC, rust would NOT let you do a type checked m/s * s => m, so using the type system for these kinds of games is silly and dangerous (I presume you would have to do the dumb thing and typeconvert to the same type -- e.g.

    (m) (speed * ((m/s) seconds))

to do multiplication which means you're inserting unscientific and reader-confusing type conversions all over the place)