ref: 18da4d07e56cdbc6f6e170c4023c4c7d9ca0bd3e 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