ref: db34187dc25f6b3f1a85b85c4dcf9a69b1cb4d54 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