DiscountManager::roundValue

static function roundValue($value, string $currency): float
{
	if (self::$saleIncluded === null)
		self::$saleIncluded = Loader::includeModule('sale');
	if (self::$saleIncluded)
		return SaleDiscountActions::roundValue($value, $currency);
	else
		return roundEx($value, CATALOG_VALUE_PRECISION);
}