[RFC][VOTE] Normalize array's "auto-increment" value on copy on write

Hello PHP, I just started the vote on https://wiki.php.net/rfc/normalize-array-auto-increment-on-copy-on-write and I will close it in one week from now From the discussion (https://externals.io/message/105992) it emerged the intention to make the proposed change even stricter. But, given that's a way bigger problem and difficulty, I decided to proceed with this anyway for now, because it's compatible with future improvements, and because fixes the most dangerous inconsistencies currently observable, that is, arrays passed to third parties with unpredictable auto-increment values. Thank you for reading and for voting