ref: 3f5b9c674dc0f3e9e43d17acf1b7cfbb409b89d1 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