Well, I know that Symbol::gensym keep a reference to an global GLOB at Symbol::GENx. What is not very good at POO. But for GLOB you need to keep it in some point!

To fix that the code need a DESTROY that destroy the GLOB too.

Note that you really need to put the different types inside the GLOB! You can't use a hash ref, since you want to do: $this->{key}, and this will go to get_hash(), and inside it you can't use $this->{key} or $this->[0], or you make an infinity loop of nothing. So, if you bless a hash, but make the access of it using overload you can't access again the hash, specially if you want to use overload for ARRAY access too!!! This is why I use GLOB, since is the only way that I found to access data inside the object wihtout use ways that are overloaded.

If you can find a way to make the same thing without Symbol::gensym (GLOB), please send! ;-P

Update:
From POD: "Symbol::gensym creates an anonymous glob and returns a reference to it"!
The GLOB is already anonymous! Test to creat multiples GLOB from gensym(), you can see that is always *Symbol::GEN0.

Graciliano M. P.
"The creativity is the expression of the liberty".