fix warning for number constraints with PHP 7.x#19798

OskarStark merged 1 commit intosymfony:5.4symfony/symfony-docs:5.4from

alexislefebvre:feat-fix-warning-for-number-constraints-with-PHP-7.xalexislefebvre/symfony-docs:feat-fix-warning-for-number-constraints-with-PHP-7.xCopy head branch name to clipboard