ref: 1561b4dcc0b10e7d6efa7b0dc8e8f687cf490983 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