Smallmap.Make
module Ord : Stdlib.Map.OrderedType
type key = Ord.t
type 'a t
val bindings : 'a t -> (key * 'a) list
val add : key -> 'a -> 'a t -> 'a t
val empty : 'a t
val find : key -> 'a t -> 'a
val fold : (key -> 'a -> 'b -> 'b) -> 'a t -> 'b -> 'b