ref: 100d3a203f8ee81adc5e31adac2d2c6c0ce65e5f 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