Re: [w3c/browser-payment-api] Make UAs throw for invalid monetary amounts (#256)

The problem with this change is that it doesn't deal with the updating case where throwing isn't a possibility. Just like in #249 it would have been easy to throw in the constructor in this situation but then the behaviour would be inconsistent in `updateWith()`. We didn't really want the bad update to cause the payment request to be terminated because doing so looks like a user agent bug and not a page bug. Also it will be easier to debug the problem when a user explains what happens.

So for the currency value I'd prefer a different proposal.

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