PHP8.4 alpha 1 warnings - nullable is deprecated, the explicit nullable type must be used instead

[ipajen]

Environment
WordPress: 6.6-RC2
PHP: 8.4.0alpha1
Server: Apache/2.4.59 (Win64) PHP/8.4.0alpha1 mod_fcgid/2.3.10-dev
Database: mysqli (Server: 8.3.0 / Client: mysqlnd 8.4.0alpha1)
Browser: Edge 126.0.0.0 (Windows 10/11)
Theme: Twenty Twenty-Four 1.1
MU-Plugins: None activated
Plugins:

• Restaurant Menu 2.4.4
• WordPress Beta Tester 3.5.5

Deprecated: mp_restaurant_menu\classes\Export::mptt_authors_list(): Implicitly marking parameter $post_ids as nullable is deprecated, the explicit nullable type must be used instead in C:\wamp64\www\wp\wp-content\plugins\mp-restaurant-menu\classes\models\class-export.php on line 348

PHP 8.4.0alpha1

PHP 8.4: Implicitly nullable parameter declarations deprecated
implicitly-marking-parameter-type-nullable-deprecated