in reply to Memory leaks and reference counting within Perl.
Devel::Peek enables you to see the reference counts of variables, among a lot of other things. You need to understand some of what goes on "under the hood", for which I found Simon Cozens' Perl 5 Internals tutorial very useful.
I think that playing with Dump (which is a Devel::Peek function) will shed some light on how things work.
Arjen
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Seekers of Perl Wisdom