ref: 6b42532ddf1b3ebfd1c5b9b369f8478a7d8711ea 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