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use strict;
use warnings;
...
  print Dumper (%$dbm);

Encountered CODE ref, using dummy placeholder at /usr/lib/perl/5.10/Da
+ta/Dumper.pm line 190.
$VAR1 = 'DB';
...
                 '_dumpsub_' => sub { "DUMMY" }
               }, 'MLDBM::Serializer::Storable' );