ref: cc4e5e7f81d55cd0d6757d15c6ebd21e8f60b90a 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