half-blind-sort is a great idea (and so is {rand()<rand} ).
Couldn't resist sort{rand(2)-1} as it's shorter by 2 and truer blind.
Update/Correction: as vr rightly notes, int(rand(2)-1) is constantly 0!!! Because sort expects an integer back from the comparison BLOCK and int()'ing rand(2)-1 leaves just 0 :(. So, both these compensate for that bug and are uniformly random too: sort{rand(6)-4} and sort{1-rand(3)%3}
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