Perl initializes its scalars to "undef", not 0. If you try to use undef as an array index, it will convert it to 0 but issue a warning. I'd prefer it to be an e

Perl initializes its scalars to "undef", not 0. If you try to use undef as an array index, it will convert it to 0 but issue a warning. I'd prefer it to be an error instead.