For small hashes, ordering isn't necessarily "random" from one hash to the next

I believe it's the version of perl that's important here.
IIRC, with perl-5.16 and earlier the order was always repeated, but for later versions of perl the order varies at random (for some meaning of "at random").
For example, with Strawberry Perl 5.18.2.1 your one liner produces for me: 
0 4 5 3 2 8 1 7 6
3 5 0 4 6 7 1 8 2
7 6 2 8 1 5 3 0 4
6 7 8 1 2 5 3 0 4
7 6 2 8 1 5 3 4 0
3 5 0 4 6 7 1 8 2
7 6 2 1 8 5 3 0 4
3 5 4 0 7 6 2 1 8

[download]
and the output changes again when I re-run it.

Interestingly, it's not strictly random - 0, 3, 4 and 5 always appear (in varying orders) either at the beginning or the end of the sequence.

(I think it's still possible, via Configure args, to build perl with the pre-5.18 behaviour, though this is rarely done.)

Cheers,
Rob

In reply to Re^5: Pick k numbers at random -- hash keys by syphilis
in thread Pick k numbers at random by Chuma

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