Freer doesn’t come for freeThe question on how to best structure functional programming applications in either Haskell or Scala is still out with various ways to achieve modularity, encapsulation and testability. In the past I have been an advocate of the `Eff` monad, based on Oleg Kiselyov’s work on “Freer monads, more extensible effects”. However, after being involved with 2 large applications (both in Scala and Haskell)
