> - operations on intervals: "iter_interval", "fold_interval", 
> and "interval"

In order to solve the mentioned operations, I usually use Splay-trees,
which is part of the CDK. They have the following operations.

    val floor: 'a t -> key -> key * 'a
	(* [floor s c] returns the greatest element with [key <= c] *)
    val ceil: 'a t -> key -> key * 'a
	(* [ceil s c] returns the smallest element with [key >= c] *)
    val prev: 'a t -> key -> key * 'a
	(* [prev s c] returns the greatest element with [key < c] *)
    val next: 'a t -> key -> key * 'a
	(* [next s c] returns the smallest element with [key > c] *)

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