ref: 7ed35649bb5b7ce79c7a01f1b1d8cb850b8d388a 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