ref: 8a8f41b17cb8c2f51b26e3e3a541e7b0a876ec3c 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