ref: e1967b76c1fdf21a0b8f27b608d43b5b6b3366bc 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