text: var freezeObject=require('./freezeObject');
  
      'use strict';
  
      /**
       * Constants used by {@link Clock#tick} to determine behavior
       * when {@link Clock#startTime} or {@link Clock#stopTime} is reached.
       *
       * @exports ClockRange
       *
       * @see Clock
       * @see ClockStep
       */
      var ClockRange = {
          /**
           * {@link Clock#tick} will always advances the clock in its current direction.
           *
           * @type {Number}
           * @constant
           */
          UNBOUNDED : 0,
  
          /**
           * When {@link Clock#startTime} or {@link Clock#stopTime} is reached,
           * {@link Clock#tick} will not advance {@link Clock#currentTime} any further.
           *
           * @type {Number}
           * @constant
           */
          CLAMPED : 1,
  
          /**
           * When {@link Clock#stopTime} is reached, {@link Clock#tick} will advance
           * {@link Clock#currentTime} to the opposite end of the interval.  When
           * time is moving backwards, {@link Clock#tick} will not advance past
           * {@link Clock#startTime}
           *
           * @type {Number}
           * @constant
           */
          LOOP_STOP : 2
      };
  
      module.exports= freezeObject(ClockRange);
  