ref: caa2cd99e469f598d19a03f2ba4d3c23c6e9d6f5 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