Control.Category: now with kind polymorphismJust a quick update. The other day, I pushed a patch to the Haskell base library that will enable kind polymorphism for the Category type class. That change will come to the public when GHC 7.8.1 is released. This is a simple change that makes Category far more general, while not breaking any code already out there. (The change was originally proposed by none other than Edward Kmett, although he’s
