Fix and improvements for PHPStan (rule level 5) #1442
Merged
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This PR replaces #1439. It includes all the feedback from @AJenbo given in #1439. Thanks @AJenbo!
It fixes the PHPStan issues reported in #1425, #1424, #1423 and #1346. It also improved the PHPStan rule level to 5 🎉