I take it that's just a first version ;--)

The results aren't too spectacular with things like:

--- #YAML:1.0
- &1 !perl/my_class
  bar: 2
  foo: 1
- object: *1
[download]

The yaml file was generated by doing perl -MYAML -e'my $o= bless { foo => 1, bar => 2}, "my_class"; print Dump [ $o, { object => $o}];' > test_object.yaml

Getting your tool to cover the entire spec would certainly get you well on your way to Perl Hacker!