Did you test this?

No. Did you read my .sig? :)

To my surprise, you're right. It does just recreate the orginal without getting rid of duplicates. To avoid the intermediate hash, you have to force the first reverse (taken in order of execution) to return a referance to hash, which is then immediately dereferanced:

my %hash_without_duplicates = reverse %{ +{ reverse %hash_with_duplica
+tes } };
[download]

I actually have tested the above :)

----
I wanted to explore how Perl's closures can be manipulated, and ended up creating an object system by accident.
-- Schemer

Note: All code is untested, unless otherwise stated