function Interval(start, stop) {
  /**
   * The beginning of the interval.
   * @type {number}
   * @default 0.0
   */
  this.start = start ?? 0.0;
  /**
   * The end of the interval.
   * @type {number}
   * @default 0.0
   */
  this.stop = stop ?? 0.0;
}
Represents the closed interval [start, stop].
@alias Interval
@constructor

@param {number} [start=0.0] The beginning of the interval.
@param {number} [stop=0.0] The end of the interval.