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It seems like is_callable($errorFormat...tion(...) { /* ... */ } can also be of type null; however, parameter $errorFormatter of Marcosh\PhpValidationDSL...tionAndErrorFormatter() does only seem to accept callable, maybe add an additional type check?
(
Ignorable by Annotation
)
If this is a false-positive, you can also ignore this issue in your code via the ignore-type annotation