I did not know F# supported that, which is good news. It means that there's feasible, theoretically sound way of solving this problem. In Elm, it would require making the mathematical operations aware of units and therefore even more "special" that the *number* not-a-typeclass. But units still feel like the right abstraction for this problem, especially if strings could be marked as having a unit (never mix up usernames and passowrds again!), so I'd much rather consider adding units of measure to the language *later* than some weird, halfbaked idea *now.*
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