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warn Data::Dumper->Dump(
    foo   => $foo,
...
    array => \@array,
    that  => \%that,
);

warn Dump {
    foo   => $foo,
...
#vs

warn Dump [ $foo, \%this, \@array, \%that ];

my $dumper = Data::Dumper->new( purity => 1, terse => 1, deepcopy => 1
+ );
warn $dumper->Dump( [ $foo, \%this, \@array, \%that ] );