ref: 2f8d3d7f2e4e3592b0a2fce30a4ec218aafe9bce 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