Sure, but in the context of this question—which is about dealing with uniqueness—that's not likely to be very helpful. Unless, of course, the uniqueness of the reference itself is sufficient. But if you have, say, my $a = ; my $b = ; and want to insert them into a store only if an identical structure doesn't already exist in that store... Tie::RefHash probably won't help because you'll need to do a 'deep' compare.
"My two cents aren't worth a dime.";
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