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  1. or download this
    ShoppingCart->new(
        user => $user,
        map { $_->id => $_->quantity } @products,
    );
    
  2. or download this
    ShoppingCart->new(
        user => $user,
        ( map { $_->id => $_->quantity } @products ),
    );
    
  3. or download this
    use CGI;
    use Data::Dumper;
    ...
        foo => $q->param('foo'),
        bar => 1,
        ];
    
  4. or download this
    foo => scalar $q->param('foo'),
    
  5. or download this
    ShoppingCart->new(
        user => $user,
        map { $_->id => $_->quantity } @products,
        bank_account => 99,
    );