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  1. or download this
    $template->param(
  some_var => 10,
  (some_var => $hash{some_possibly_undefined_key}) x!! exists($hash{so
+me_possibly_undefined_key}),
);
  2. or download this
    $template->param(
  some_var => exists $hash{some_possibly_undefined_key} ? $hash{some_p
+ossibly_undefined_key} : 10;
);
  3. or download this
    {
   package MyTemplate;
...
       $self->SUPER::param(%p);
   }
}