ref: f5c244010143f1b7b90c66dd54d8b4d8d3c0a7df 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