It seems like is_array($value) ? $valu...== null ? '' : $value)) can also be of type true; however, parameter $data of CaptainHook\App\Git\Diff\FilterUtil::sanitize() does only seem to accept array, maybe add an additional type check?
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Ignorable by Annotation
)
If this is a false-positive, you can also ignore this issue in your code via the ignore-type annotation