to review and then add:
- https://wiki.php.net/rfc/noreturn_type / https://betterprogramming.pub/the-never-return-type-for-php-802fbe2fa303
- https://wiki.php.net/rfc/noreturn_type
- (add read fibers - already added below)
- https://github.com/php/php-src/labels/RFC
Work in Progress: