ref: 0ce2bbf3b5dbb9c899a9a680ff8262be44b1d5ef 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