Update config 'maxlength_attributes' default value to integer to fix broken tests

Found the same issue and the patch fixes it, 🐛 Missing config schema RTBC is needed too.

DYdave → changed the visibility of the branch 3413783-make-maxlengthattributes-nullable to hidden.

Thanks everyone!

In the end we preferred sticking with an integer value and just change its default from false to 255, like other maxlength config fields.
It appears to simplify slightly the code while keeping the same logic and results.

Added update hook to set the value to 255 if it is currently empty.

The changes have been merged!

Thanks!

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