ref: 9f03baca7cf1e2bb69b9f28429127b9e43d0f8ee 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