preface

An opinionated library for function programming (à La Haskell)
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Library preface.specs
type ('a, 'b) t

The type held by the Closed Profunctor.

val dimap : ( 'a -> 'b ) -> ( 'c -> 'd ) -> ( 'b, 'c ) t -> ( 'a, 'd ) t
val closed : ( 'a, 'b ) t -> ( 'c -> 'a, 'c -> 'b ) t

Act on the input type of a function.