ref: 02f19e5b2e6a94199d6eb9a97417e1feb3b2d0aa 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