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keymonad's Issues

Quantify over the scope type variable (s) last

When you finalize the library, consider quantifying over the scope type variable s last now that the order matters

newKey :: forall a s. KeyM s (Key s a)
newKey = KeyM $ \s -> Key (supplyName s)

This lets us write

-- CURRENT: newKey @_ @Int :: forall k (t :: k). KeyM t (Key t Int)

newKey @Int :: forall k (t :: k). KeyM t (Key t Int)

Testing heterogeneous equality

testEquality compares two keys for equality that possibly have a different type, but it doesn't allow comparing Key s Int and Key s Maybe by producing a proof HRefl

-- this definition to go into Data.Type.Equality
data (a :: k1) :~~: (b :: k2) where
   HRefl :: a :~~: a

testHEquality :: Key s a -> Key s b -> Maybe (a :~~: b) 

Consider adding it when it when they get added to base.

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