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Hi,
This PR is the result of fixing easy issues from the two first levels of Psalm.
This is the starting point of trying to begin #7762. If this goes smoothly, my goal is to continue fixing errors by slowly increasing the Psalm's levels. Eventually, the idea would be to add Psalm to the CI and to add template annotation to interfaces and exposed classes to help tools like phpstan and psalm understand Doctrine without the need of stubs or plugins.
I'm always trying to learn so don't hesitate to ask for changes or anything!
Thanks!