ref: 0d7d70e5b1a4b5c7ae618d6d04fb30848b18c08f 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