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perl -MData::Rmap=rmap_hash -le 'rmap_hash {print keys %{$_->{a}} } ({
+a=>{1,2}})'

push @return, $self->_rmap($_) for values %$_;

# added exists check
perl -MData::Rmap=rmap_hash -le 'rmap_hash {print keys %{$_->{a}} if e
+xists $_->{a} } ({a=>{1,2}})'
1