ref: a2ef6bfcd8de0ae9f7f2df2fcdd692bde6ea422c 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