ref: 56d1f1bccd4f943b43e5b8043dd63a17ceb2b2b1 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