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sub util_remove_duplicates {
  my %hash;
...
  @hash{ref $_[0] eq 'ARRAY' ? @{$_[0]} : @_} = ();
  return keys %hash;
}

sub util_remove_duplicates {
  @{$_[0]} = keys %{ { map{$_=>1} @{$_[0]} } };
  return;
}