[RFC] Exempt input type and value validation from BC Break policy

Hello internals, I would like to propose a short policy RFC to formally exempt input type and value validation from our BC Break policy. The current wording of the policy already permits us to add validation of inputs, but recently any such changes have been asked to submit an RFC instead. We believe that requiring an RFC for this type of change is detrimental and adds unnecessary friction for routine maintenance activity and new contributors. RFC: https://wiki.php.net/rfc/policy-exempt-type-value-error-bc-policy Best regards, Gina P. Banyard