ref: 49c4706703a9e3cebc6ea39e8bf4ba0f6a1d43ab 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