Elm - creating a list with multiple value Types

multiList.elm

type MultiValue
    = StringValue String
    | IntegerValue Int
--... add other possibilities here


myList : List MultiValue
myList =
    [ StringValue "a"
    , IntegerValue 2
    , StringValue "b"
    ]



{-| using these values
eg. multiply all numbers in the list per 2. leaves strings alone -}
newList =
    myList
        |> List.map
            (\value ->
                case value of
                    StringValue v ->
                        StringValue v

                    IntegerValue v ->
                        IntegerValue v * 2
            )