Sourceval find : ('k, 'v) t -> string -> 'v option Sourceval find_exn : ('k, 'v) t -> string -> 'v Sourceval set : ('k, 'v) t -> key:string -> data:'v -> ('k, 'v) t Sourceval mem : ('k, 'v) t -> string -> bool Sourceval of_alist_exn : (string * 'v) list -> (string, 'v) t Sourceval to_alist : ('k, 'v) t -> (string * 'v) list