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In this talk for Scala Days, Miles sabin shows why HLists are so much harder to support, and explain the type class and dependent type based implementation techniques used in the map and fold implementations in shapeless.
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Miles has been doing stuff with Scala for more than ten years, currently with Underscore Consulting. He is a cofounder of Typelevel and his best known project, the Scala generic programming library shapeless, is the weapon of choice wherever boilerplate needs to be scrapped or arities abstracted over.