_toObservable () {
    function wrap (result) {
      return new Observable(observer => {
        observer.next(result)
        observer.complete()
      })
    }
    return new Observable(observer => {
      this._result.subscribe({
        complete: () => observer.complete(),
        next: result => observer.next(new RxResult(wrap(result)), this._state),
        error: e => observer.error(e)
      })
    })
  }
Create a {@link Observable} for the current {@link RxResult}


@package
@experimental
@since 5.0
@return {Observable<RxResult>}