val k_to_file : t ‑> string ‑> string
val set_ : t ‑> string ‑> string ‑> (unit, string) Result.result Lwt.t
val set : t ‑> string ‑> string ‑> (unit, string) Result.result Lwt.t
val remove : t ‑> string ‑> unit Lwt.t
val fold : t ‑> f:('a ‑> (string * string) ‑> ('a, 'b) Result.result Lwt.t) ‑> x:'a ‑> ('a, 'b) Result.result Lwt.t
val flush : t ‑> unit ‑> unit