ref: 76c34b542f0b5c0cd6cc60a9cef9d53b6fc899d1 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