type value =
  | WUnit
  | WInt of int
  | WBool of bool
  | WString of string
  | WTuple of value list
  | WRecord of (string * value) list
  | WCollection of (int * value) list

type op = WInsert of int * value | WRemove of int | WReplace of int * value

val to_string : value -> string
val field_value : string -> (string * value) list -> value Delta_runtime.outcome
val parse_value : string -> value Delta_runtime.outcome
val parse_input : string -> (int * value) list Delta_runtime.outcome
val parse_updates : string -> op list list Delta_runtime.outcome
val read_file : string -> string Delta_runtime.outcome