type t = [
Json type. This is compatible with Yojson.Basic.t
exception Casting_error of string * t
This is thrown in the case that an unsafe cast (like to_list below) fails.
This converts a `List (t list) to 't list, or throws a Casting_error in the case that the input is not a `List.
This converts an `Assoc (string * t list) to ('a, 'b) Hashtbl.t, or throws a Casting_error in the case that the input is not an `Assoc.