ref: 20cea781b95e1a6c1fa2f6cd2bb6c05ec9a4480d 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