ref: 5aaf4d7e6e7eb9e55bf314a2db83ab25b834b4fb 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