Improving void

Right now the definition of Control.Monad.void is: void :: Functor f => f a -> f () void = fmap (const ()) I propose we replace it with void :: Functor f => f a -> f () void = (() <$) This expands out to the former definition by the default definition of (<$) and Data.Functor.Functor exports (<$) explicitly to make it possible to optimize this sort of thing. It seems a shame not to use it. Discussion Period: 2 weeks