[Haskell-beginners] Newtype to avoid orphans

Hello, In the library I am writing, I declare a type Vector for Data.Vector Double. I then create a Num instance for it as it doesn't have one yet. GHC tells me that this instance is an orphan. After reading several answers to issues like mine, I want to get rid of these orphans. The advice I saw mostly is to use the newtype keyword. Is there a way to do it nicely, instead of copying most of the API of Data.Vector ? Now, the only thing I can see is do like in this example: import Data.Vector as V newtype VectorD = VectorD (V.Vector Double) map :: (Double -> Double) -> VectorD -> VectorD map f (VectorD v) = VectorD $ V.map f v Is there a better way ? Best regards, Adrien