ref: 24e4c23a889d9e7cc60e5da2bc9df0ec0f8ab04b 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