package accessor

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type ('a, 'b) t
val mapper : ('at -> f:('a -> 'b) -> 'bt) -> ('a, 'b) t -> ('at, 'bt) t

A legal implementation of this function must satisfy the following properties:

mapper (fun a ~f -> f a) = Fn.id
Fn.compose (mapper f) (mapper g) = mapper (fun a ~f:h -> f a ~f:(g ~f:h))