ref: c7e6d109bcd7e0d0b33c5e134c83e3efe9154ef9 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