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		if ($key = m/^ /){
			# we have unescaped a leading space.
		}elsif ($key eq 'EMPTY'){
			$key = ''
		#}elsif($key eq 'REF'){
		# 	return $ref->NEXTKEY();	# next
		#}elsif($key =~ m/^ARRAY){
		# 	return $ref->NEXTKEY();	# next
		}else{
			# per-container metadata does not
			# appear in iterations through data.
			return $ref->NEXTKEY();	# next
		}
	};
	wantarray or return $key;
	return @{[$key, $ref->FETCH($key)]};
   };
   
   sub DESTROY{
       # no warnings;
       delete $IteratorListings{$_[0]};