Phpstan level 10 reports an enormous number of errors. So does the excluded missingType.iterableValue. I do not plan to introduce either any time soon. But I will submit piecemeal changes from time to time. Changes will be mostly limited to phpdoc type declarations.
PHPDoc types can sometimes be entirely expressed as PHP native types. It
is better because it avoids code duplication and enables type runtime
check.
This will help us slowly migrate away from PHPDoc typing to PHP native typing.