The expression return apcu_delete($this...etActualCacheKey($key)) could return the type string[] which is incompatible with the type-hinted return boolean. Consider adding an additional type-check to rule them out.
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49
}
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/**
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* {@inheritDoc}
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*/
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1
public function keys(): array
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{
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1
$iterator = new APCUIterator('/^' . preg_quote($this->getPrefix()) . '.*$/', APC_ITER_KEY);