function TakeLastObserver(o, c) {
      this._o = o;
      this._c = c;
      this._q = [];
      __super__.call(this);
    }
Prepends a sequence of values to an observable sequence with an optional scheduler and an argument list of values to prepend.
 @example
 var res = source.startWith(1, 2, 3);
 var res = source.startWith(Rx.Scheduler.timeout, 1, 2, 3);
@param {Arguments} args The specified values to prepend to the observable sequence
@returns {Observable} The source sequence prepended with the specified values.