WeakRef looks great -- I've wanted something like this on several occasions. Unfortunately, it seems to require a patch to the Perl core. Any possibility of a weakening function becoming a standard part of Perl?
Comment on Re: Re (tilly) 2: Building an object tree
I don't know what the plans are for it. I think that the
idea of a module was to give people a chance to play with
the API before they locked an interface down forever.
OTOH Perl 6 looks like it is heading towards true garbage
collection, so WeakRef is probably going to be
filling a need no longer felt.