ref: 01d9c59aa0f27db7bd3b9b8c1978c9a65c5e60a0 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