ref: 5c4e12b31f1e35c0a915bfaf8dffec06c625bcea 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