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Lazy variant of Hashed? #155

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@mikeplus64

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@mikeplus64

This would be useful for me for a type (living in a TVar) that:

  • updates frequently
  • has an expensive hash function
  • needs to check hashes infrequently

The implementation should be exactly the same as 'Hashed' without the {-# UNPACK #-} !Int. Maybe have a typeclass:

class Hashable1 h => CacheableHashable h where
  hashed :: Hashable a => a -> h a
  unhashed :: h a -> a

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