It's following the illustrious Haskell tradition of barely-documented code. (Non-snarky follow-up: Haskell code is often woefully under-documented, for whateve

It's following the illustrious Haskell tradition of barely-documented code. (Non-snarky follow-up: Haskell code is often woefully under-documented, for whatever reason. Possibly because people think that the type signatures are sufficient, or possibly because Haskell code lends itself to concision and documentation runs counter to that, or possibly because Haskell projects are often the result of one person's work, diminishing the need to explain oneself. In any case, it's an unfortunate fact of many Haskell apps and libraries.)