sig
type key
type t
type sexpable = t
val sexp_of_t : sexpable -> Sexplib.Sexp.t
val t_of_sexp : Sexplib.Sexp.t -> sexpable
val create :
(Piecewise_linear.S.key * float) list ->
[ `Fail of string | `Succeed of Piecewise_linear.S.t ]
val get : Piecewise_linear.S.t -> Piecewise_linear.S.key -> float
end