function RangeObservable(start, count, scheduler) {
      this.start = start;
      this.rangeCount = count;
      this.scheduler = scheduler;
      __super__.call(this);
    }
Convert an object into an observable sequence of [key, value] pairs.
@param {Object} obj The object to inspect.
@param {Scheduler} [scheduler] Scheduler to run the enumeration of the input sequence on.
@returns {Observable} An observable sequence of [key, value] pairs from the object.