I believe it should be possible to prove something like
g . f Const = f (g . Const)
where
f :: Lens' A B
g :: forall x. Const B x -> Const B x
I believe it should be possible to prove something like
g . f Const = f (g . Const)
where
f :: Lens' A B
g :: forall x. Const B x -> Const B x