ref: 2b1c13ce2d20ce2b4e68e1daf08a1679d94fe397 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