in reply to Is there an easy way to assign guaranteed unique values to a simple array without looping through whole array?

if i understand correctly, you can do it with an intermediate hash and grep. 
my %seen;
my @nodupes = grep { not $seen{$_}++ } @mayhavedupes;

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as for whether you consider grep "having to loop" or not, well, it's a lot less loopy than sorting keys...
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