ref: fefdce5c957865ebcf2e30c99b5ff1b6e09e0efb 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