Refactor to have common handling for typeglobs and glob refs
Add helper function strip_refaddr

To recursively remove __refaddr keys/values from an encoded Perl data structure
teach encode_perl_data() to handle self-referential data structures
Wrap PerlValue parsing in try/catch

If the parsing has a problem, it won't kill the debugger
Add a new PerlValue type for recursive references

It renders by showing the reference type+address and a circular icon