magento2.3 – Can the round method be intercepted?

I’m trying to override the round method in vendormagentomodule-directoryModelPriceCurrency.php. This is the method:

 * @inheritdoc
public function round($price)
    return round($price, 2);

And this is the code I have in a plugin to override the above method:

class PriceCurrency
    public function aroundRound(MagentoDirectoryModelPriceCurrency $subject, callable $proceed, $price) {
        return round($price, 4);

My code doesn’t work. I can easily override other public methods in the PriceCurrency file! Can that method be overridden?