ref: b6c0b67ea6692977eff0cd08d2a4d9b6a66297aa 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