PROPOSAL: Make Data.Type.Bool.If polykinded

Ola! Currently we have: type family If cond tru fls where If True tru fls = tru If False tru fls = fls Unfortunately, this appears to turned into a monomorphicly kinded type family by GHC, which means it’s impossible to do foo :: If cond () (“Condition does not hold” ~ “”) => Foo -> Bar or similar fancy constraints. I hereby propose altering If to: type family If (cond :: Bool) (tru :: k) (fls :: k) :: k where If True tru fls = tru If False tru fls = fls Allowing it to work with kinds other than *. Discussion period: 2 weeks? Seems like a minor change. Cheers, Merijn