ref: 73c618bf4af5f96b4d1c0790662b6bd9e0a1f33e 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