ref: f16bf0e4f8dd5f23b41cfbfa6c24fd0ab79e6dad 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