ref: 705f2d8c1f2d2b9f68ea7ef30af3b43d69a64b6a 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