Add Choice, Cochoice, Closed, Strong, Costrong instances for Sum

ekmett / profunctors

Haskell 98 Profunctors

http://hackage.haskell.org/package/profunctors

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Closed RyanGlScott closed 4 years ago

RyanGlScott commented 4 years ago

This follows up on #63 by adding more instances for Data.Bifunctor.Sum to give it parity with Product.