sig
type r
type t = r record
val jtype : Package.jtype
val of_json : json -> t
val to_json : t -> json
val default : t
val has : (Data.Record.S.r, 'a) Data.Record.field -> t -> bool
val get : (Data.Record.S.r, 'a) Data.Record.field -> t -> 'a
val set : (Data.Record.S.r, 'a) Data.Record.field -> 'a -> t -> t
end