ref: 7d590b64d3ad57239c8835b2fd1a0d2db2b2981a 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