ref: 49b3d1b79ed5ac93301f2a9c2f69f03a4bd02b5b 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