Re: [w3c/browser-payment-api] fix: delegate total and error member checks to WebIDL (#425)

I thought having a generic place to dump optional things might be good for extensibility in the future. Don't mind switching tho. 

> On 3 Mar 2017, at 6:17 am, Domenic Denicola <notifications@github.com> wrote:
> 
> I don't understand the point of PaymentDetailsMaybeMembers. Why not just inline PaymentItem total into PaymentDetailsUpdate, as I suggested in #425 (comment) ?
> 
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