Lovely, and very handy. But I'm somewhat confused as to what the parameters are in the subroutine...
the second is the 'length' of the return string, that's obvious, but what's the first?
Update: It always helps to read code at some point _other_ than first thing in the morning. Param 1 is min length, param 2 is max length.
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It's not pessimism if there is a worse option, it's not paranoia when they are and it's not cynicism when you're right.