Just as memory hungry, still not order preserving, and still broken with regards to undefined values, but faster approach:
my %seen;
@seen{@list}=();
my @uniq = keys %seen;
And if you want to wrap it up without "leaking" lexicals:
my @uniq = do {
my %seen;
@seen{@list}=();
keys %seen;
};
This approach does not (explicitly) iterate - more of the data structure setup work is done implicitly by perl.
Makeshifts last the longest.
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