Nullable types must be explicit

beloglazov91 → changed the visibility of the branch 3509308-nullable-types-must to hidden.

liam morland → made their first commit to this issue’s fork.

I added one more explicit null declaration and tests now pass on max PHP. I have reviewed the other commit and I agree that it is the correct change.

Looks good (i've looked at a lot of these lol) and works, thank you! As noted already in the issue summary there are no compatibility concerns given Drupal core's minimum PHP requirements.