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PHPStan was upgraded to 2.0 in November, but we're not ready to upgrade as it detects a lot of new errors.
That said our first step is to upgrade to the latest 1.x.x release, per:
https://github.com/phpstan/phpstan/blob/2.0.x/UPGRADING.md
There is one upside to this upgrade, which is to be able to disable errors using their identifier (added in 1.11).
Also it seems like a low-value error was removed from L5, so removed it from our configuration file.