I don't think modern Haskell is a single paradigm language. As I said above, it has good support for imperative programming and lots of imperative code has been

I don't think modern Haskell is a single paradigm language. As I said above, it has good support for imperative programming and lots of imperative code has been written in Haskell. Even the GHC compiler is full of imperative code and uses algorithms with mutation where it makes sense (e.g. unification).