2.x Fix PHPStan issues on level 0 #2659
Merged
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Issue
There are various issues raised by PHPStan on level 0.
Solution
This pull request resolves some of them. Other issues will be resolved in separate pull requests.
Impact
More robust code.
Usage Changes
Some return type changes.
Considerations
Testing
Should be covered through existing tests.
Except the new return types, which we should add tests for. Coverage shrinked because of this.
Todo