Nullable types must be explicit

Code looks good and fixes the PHP 8.4 deprecation messages.

Marking this as RTBC. Thank you.

MR works fine ! Thanks.
I no longer see alerts.
Marc

This needs to be fixed in 4.x branch first.

There are a few Git merge conflicts need to be resolved.

Exported MR to patch for composer.

Eh. looking at the 4.x branch and there from what I can see there is nothing to do.