BasketItemBase::normalizeValue

protected function normalizeValue($name, $value)
{
	if ($this->isPriceField($name))
	{
		$value = PriceMaths::roundPrecision($value);
	}
	elseif ($name === 'VAT_RATE')
	{
		$value = is_numeric($value) ? (float)$value : null;
	}

	return parent::normalizeValue($name, $value);
}