Re: [w3c/payment-request] Should PaymentItems have a type? (#163)

Yes, the main issue is about having the tax line not be part of the scrollable list of other line items (there could be hundreds).

> The merchant has to calculate tax amount and localize display items themselves anyways, so having the merchant order the display items themselves doesn't seem unreasonable.

The merchant can try to be helpful and always sort tax to the bottom of their list of items but that doesn't really help if there are too many items that the item list becomes scrollable. In the [image above](https://github.com/w3c/payment-request/issues/163#issuecomment-348412913), the section above the horizontal rule and below "Order Details" will be scrollable.

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