Missing Return Type for RenderableData::jsonSerialize()

Here is a suggested patch.

Adding a patch with the array return type as suggested by the OP

Queued for test and changing to needs review.

I have not tested, but I have reviewed this issue. Either of the patches in #2 or #3 should resolve the problem for PHP 8.1+, and either patch should be compatible with lower versions of PHP as well.

Since the return type is known, I prefer to add a return type rather than an annotation to skip the check.

When implementing an interface in PHP, it is always allowed to specify a more restrictive return type than what the interface says. So a return type of array should work with PHP 8.1+ (where the return type is mixed) and with earlier versions (no return type).

I have added a MR based on the patch in #3, and I am hiding the two patches.

This looks good, thanks for the review and MR conversion!

Automatically closed - issue fixed for 2 weeks with no activity.