async void FetchByUuid(Guid uuid) {
  var options1 = new OVRAnchor.FetchOptions {
    SingleUuid = uuid
  };
  var options2 = new OVRAnchor.FetchOptions {
    Uuids = new Guid[] { uuid }
  };
// Both options1 and options2 will perform the same query and return the same result
  var result1 = await OVRAnchor.FetchAnchorsAsync(new List\<OVRAnchor\>(), options1);
  var result2 = await OVRAnchor.FetchAnchorsAsync(new List\<OVRAnchor\>(), options2);
  Debug.Assert(result1.Status == result2.Status);
if (result1.Success)
  {
      Debug.Assert(result1.Value.SequenceEqual(result2.Value));
  }
}