ref: 66a472dc689c3a7b2b8f077fdf01c0dc2fdc1f7d 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