ref: ce93c2af0b4aeb2c40a05f2b45c1397b7a2ced23 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