It seems like $this->fileLocator->loca...registeredSchemas[$id]) can also be of type array; however, parameter $schemaLocation of Spiechu\SymfonyCommonsBu...alidator::__construct() does only seem to accept string, maybe add an additional type check?
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Ignorable by Annotation
)
If this is a false-positive, you can also ignore this issue in your code via the ignore-type annotation
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$this->registeredSchemas[$id] = new XmlSchemaValidator(/** @scrutinizer ignore-type */ $this->fileLocator->locate($this->registeredSchemas[$id]));