ref: 3d4d7c4ca9eb30d468d71c26f4b4588c800c9d1c 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