Great answer, thank you! It's true I mostly leverage Haskell's typeclasses in the form of libraries that provide powerful abstractions. My love for them came from studying them, but that love hasn't necessarily translated into real creative use much. Ease of reading is a huge point too. I have a lot of appreciation for what Clojure can do with only the most basic building blocks, and Elm seems to embrace a similar simplicity but with types.
Thanks for the links, too. Hadn't heard of SRTPs, that's pretty cool. I assumed the solution was always modules, OCaml style, like your example - not that that's a bad thing by a long shot.
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