It seems like $args can also be of type Zend\Validator\ValidatorChain; however, parameter $binaryOptions of Rvdlee\ZfImageOptimiser\...ngquant2::__construct() does only seem to accept array, maybe add an additional type check?
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Ignorable by Annotation
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If this is a false-positive, you can also ignore this issue in your code via the ignore-type annotation
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return new Pngquant2(/** @scrutinizer ignore-type */ ...$args);