Re: [w3c/browser-payment-api] Currency amount (#101)

@mattsaxon, @halindrome this is not directly related to line items. It's the definition of how we represent currencies and amounts (effectively the CurrencyAmount datatype that we may use in various places in our data). 

These are currently used in the definition of line item BUT if there is a requirement for line items to have negative amounts a flag or similar should be added to the line item interface to accommodate this.

I want to reiterate, that we should have a way for the browser to understand some semantic about the line item and therefor know if it should be displayed as negative or positive. We already have this to some extent with the specialized line items for shipping costs.

This would help us address #56 

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