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Hash<...>* demonstration<...>(... a)
   Hash<...>* hash_ptr = new Hash<...>("demo_data", a);
...
      "demonstration_data", hash_ptr
   );
}

sub demonstration {
   my %demonstration_data = ( demo_data => shift );
...
      demonstration_data => \%demonstration_data,
   };
}

Hash<...>* demonstration<...>(... a)
   Hash<...> hash("demo_data", a);
...
      "demonstration_data", \hash    XXX BUG
   );
}