Hi @JanPetterMG this looks good, thanks. Just one closing bracket on the following line, and no need to split the if statement into multiple lines... so if you can change get_label to:
if ($this->label === null && $strict === false)

I would be happy to merge :-)

Fixed.
It's less readable, not in this case, but in more complex if else statements it can be an huge advantage.

Is it possible to release an 1.4.3 with important fixes before merging this? That will give me/us a little more time to focusing on other minor changes...

Update: Merge and release v1.5 whenever you want...