ref: aee3a905c030959ffcf3b2cc9e2b1b9ba83e1f7d 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