ref: dab3c8332f7e10f9cb5f22f85025e8e5ee7e9004 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