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my %h    = %{$self->{hash_ref}};
my @keys = sort { $h{$a} <=> $h{$b} } keys %h;

  DB<100> $self={
           hash_ref=>{item1=>'value1',item2=>'value2'}
...

  DB<103> @keys=sort {$h{$a}<=>$h{$b}} keys %h;
 => ("item1", "item2")