val list : t -> (Reference.t * Hash.t) list Lwt.tval mem : t -> Reference.t -> bool Lwt.tval read : t -> Reference.t -> (Reference.head_contents, error) Stdlib.result Lwt.tval resolve : t -> Reference.t -> (Hash.t, error) Stdlib.result Lwt.tval write : t -> Reference.t -> Reference.head_contents -> (unit, error) Stdlib.result Lwt.tval remove : t -> Reference.t -> (unit, error) Stdlib.result Lwt.t