ref: 10c5a7f3c6bd6d8c52a42f3d7ffb64eed6edf677 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