What I would use is an ADT and I make a wish for that every day in every language that’s not Haskell :D

Haskell also has operator overloading on steroids so you could use the (|>) operator from Flow and write transformations the same as you would shell pipes. I’d love to whip up an example but it’s difficult on this tiny screen. Will try to remember when I’m on my computer.

Before someone chimes in with ML propaganda, I warn you that I’m going to exercise my rights under the Castle Doctorine the moment you say “of”.