PureScript deriving newtype Number not of form

x.purs

class (LeftModule v a, RightModule v a) ⇐ Bimodule v a

newtype Pixels = Pixels (Additive Number)

derive newtype instance bimodulePixels ∷ Bimodule Pixels Number

---

Cannot derive the type class instance

  Bimodule Pixels
  Number

because the type

  Number

is not of the required form T a_1 ... a_n, where T is a type constructor defined in the same module