package geojson

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type ('s, 'a) t =
  1. | V : ('s -> ('a, 'r) Stdlib.result) * (('a, 'r) Stdlib.result -> 's) -> ('s, 'a) t
val get : ('s, 'a) t -> 's0 -> 'a0 option
val set : ('s, 'a) t -> 'a0 -> 's0
val some : ('a option, 'b) t
val none : ('a option, unit) t
val (>>) : ('a, 'b) t -> ('b0, 'c) t -> ('a0, 'c0) t