docs: function delay(delay, scheduler) {
  	    if (scheduler === void 0) { scheduler = async_1.async; }
  	    var absoluteDelay = isDate_1.isDate(delay);
  	    var delayFor = absoluteDelay ? (+delay - scheduler.now()) : Math.abs(delay);
  	    return this.lift(new DelayOperator(delayFor, scheduler));
  	}