verifyPasswordWith has an additional parameter of type (Int -> Int) with the description "A function to modify the strength"
makePasswordWith doesn't have this parameter. IMHO it's more consistent to either offer this parameter for both functions or not at all.
Also, the documentation is a bit misleading: "modify the strength" made me assume I just have to use the identity function if I didn't want to modify the strength (and why whould I want to?, I thought) Little did I realize that I needed to supply (2^) if I wanted to be able to successfully verify passwords hashed with makePasswordWith...