ref: bd0724eccecfb0ea9651cf8d5b5f8d6bfaca6e4c 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