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my $cd = Music->new(name => 'Four Seasons', arist => 'Vivaldi', rating
+ => 7,);

If you have a reference to a hash-based object, say, $objref, and you'
+re using an attribute such as $objref->{_weirdness_factor}, then chan
+ces are that somewhere in the heat of coding, you'll accidentally wri
+te something like $objref->{_wierdness_factor}++.