module Custom_properties:Json_dictionary(sig
typet =Yojson.Safe.t
val of_yojson : 'a -> ('a, 'b) Stdlib.result
val to_yojson : 'a -> 'aend)
typet =(string * J.t) list
val of_yojson : [> `Assoc of ('a * Yojson.Safe.t) list | `Null ] ->
(('a * J.t) list, string) Stdlib.result
val to_yojson : ('a * J.t) list -> [> `Assoc of ('a * Yojson.Safe.t) list ]