That after 22 years of Perl5, you've invented a requirement no else needs, and are completely impervious to reason.

Impervious to reason? What reason has anyone given to the question of why a hex constant (e.g. 0xa0) shouldn't be able to be converted in any place perl auto-converts a decimal number?

Requirement? If I was adding a restriction or forcing someone to use the feature, it would be a requirement -- but right now, it's something that doesn't work -- so no one is using it. If it was adopted, then still no one would be required to use it. In no way can it be considered a "requirement" that people would need to follow.

Extending privileges or options, to people, is never something that is "required".

Requirements are things forced upon people. In contrast, options are things people have a choice to do or not.