Piece-wise linear interpolation from float-like types to float.
module type S = Piecewise_linear_intf.S
module type S_invertible = Piecewise_linear_intf.S_invertible
module Make : 
functor (Key : Piecewise_linear_intf.Float_like) ->
functor (Value : Piecewise_linear_intf.Float_like) -> S with type key = Key.t with type value = Value.t
module Make_invertible : 
functor (Key : Piecewise_linear_intf.Float_like) ->
functor (Value : Piecewise_linear_intf.Float_like) -> S_invertible with type key = Key.t with type value = Value.t
module Time : S with type key = Time.t with type value = float
module Ofday : S with type key = Ofday.t with type value = float
module Span : S with type key = Span.t with type value = float
module Float : S with type key = float with type value = float
module Int : S with type key = int with type value = float