ref: ac9b5e75f6c6cd0171b0b86b9b109cc1d9639d5c 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