[Haskell-cafe] PolyKind for Fixed and HasResolution from Data.Fixed

Hi all! If we define HasResolution and Fixed like that: class HasResolution (a :: k) where resolution :: p a -> Integer newtype Fixed (a :: k) = Fixed Integer We can do something like that: instance KnownNat a => HasResolution a where resolution = natVal 2.3 :: Fixed 1 -- Timofeev N.D.