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  1. or download this
    use strict;
    use warnings;
    ...
    Data::Dump::Streamer::Dump \%switch_param;
    print "\n\n";
    print Data::Dumper::Dumper (\%switch_param);
    
  2. or download this
    $HASH1 = { optional => [
               { foo => 'bar' },
    ...
                              $VAR1->{'optional'}[0]
                            ]
            };