Can't the rethrowing logic be expressed using `fmap`? λ :set -XTypeApplications λ :t fmap @ (Either Error) fmap @ (Either Error) :: (a -> b) -> Ei

Can't the rethrowing logic be expressed using `fmap`? λ :set -XTypeApplications λ :t fmap @ (Either Error) fmap @ (Either Error) :: (a -> b) -> Either Error a -> Either Error b