ref: d5fe5b7cc7d8a629a190c1834f76b91a6bdb7e0e dir: /test/data/stdsort-expected/
0 1 2 3 4 5 6 7 8 9 --- 1 2 3 4 5 6 7 8 9 10 --- C Cc a aa b cC d f fuckit go