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use feature qw(state); # Perl 5.10+
use Type::Params qw(compile);
...
  
  return $sum;
}

use feature qw(state); # Perl 5.10+
use Type::Params qw(compile);
...
  
  Num->assert_return( $sum );
}

use feature qw(state); # Perl 5.10+
use Type::Params qw(compile);
...
  #
  ArrayRef->of(ArrayRef)->assert_valid( \@z );
}