ref: 4ea0da6b6c5c6b8c7c3ba3f70b210b647f612ed2 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