$ perl test_aoa.pl
1: 78688 (184871 us)
2: 78696 (298376 us)
3: 78696 (196999 us)
4: 78696 (204391 us)
5: 78696 (225786 us)

$ perl test_aoa.pl use_xs
1: 78604 (321481 us)
2: 78616 (360377 us)
3: 78616 (219468 us)
4: 78616 (211587 us)
5: 78616 (209231 us)