I was afraid of that. There are too many circular references in that module, ie

sub _reset_state {
  my $self = shift;
  $self->{_cdepth}        = -1;
  $self->{_tablestack}    = [];
  $self->{_tables}        = {};
  $self->{_ts_sequential} = [];
  $self->{_counts}        = [];
  $self->{_in_a_table}    = 0;
}

...
                 grid        => [],
                 translation => [],
                 hrow        => [],
                 order       => [],
                 children    => [],
[download]

Would have to break all those circular references in DESTROY, recursively