reference)
contravariant
https://hackage.haskell.org/package/contravariant-1.4.1/docs/Data-Functor-Contravariant.html
Data.Functor.Contravariant
Replace all locations in the output with the same value. The default definition is contramap . const, but this may be overridden with a more efficient version.
hackage.haskell.org
combinators pattern
https://wiki.haskell.org/Combinator
Combinator - HaskellWiki
There are two distinct meanings of the word "combinator" in common usage. The first is a narrow, technical meaning, namely: A function or definition with no free variables. A "function with no free variables" is a pure lambda-expression that refers only to
wiki.haskell.org
contramap
https://medium.com/@stephaneledorze/the-contravariant-functor-a7ae93e2eae0
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