I agree with the "Better yet," but in situations where I do something like option 1, I like to wrap it in a do block to maintain tight scoping: 
my @uniqWebCustomers = do{
    my %seen;
    grep !$seen{$_}++, @webCustomers;
};

[download]

#11929 First ask yourself `How would I do this without a computer?' Then have the computer do it the same way.

In reply to Re^2: Fixing: Experimental keys on scalar is now forbidden by kennethk
in thread Fixing: Experimental keys on scalar is now forbidden by TheVend

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