See also https://pvp.haskell.org/faq

0.2.1.0 (minor)

• Added Newtype instances for
  • Data.Fixed.Fixed
  • Data.Functor.Compose.Compose
  • Data.Functor.Identity.Identity
  • Data.Monoid.Alt
  • Data.Monoid.Ap
  • Data.Monoid.Dual
  • Data.Ord.Down
• Declare Control.Newtype explicitly as Trustworthy under SafeHaskell