<html><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8"></head><body><div>data Foo :: (forall a. a -> Maybe a) -> Type</div><div><br></div><div>Neither Foo nor Foo 'Just is Typeable. There seems to be a certain sense to excluding Foo proper, because it can't be decomposed with Fun. But why not Foo 'Just? Is there a fundamental reason, or is that largely an implementation artifact?</div><div><br></div><div id="composer_signature"><meta http-equiv="Content-Type" content="text/html; charset=UTF-8"><div style="font-size:85%;color:#575757">David Feuer</div><div style="font-size:85%;color:#575757">Well-Typed, LLP</div></div></body></html>