Re: [w3c/payment-request] Add paymentMethodErrors, payerErrors, to PaymentDetailsUpdate (#768)

> One question is whether the some error values can be updated via updateWith() on an unrelated event. For example, requestShipping and requestPayerName are all true and merchant calls updateWith() on payer detail change event as follows.

I think it's fine, tbh. 

> In this case, should we allow shippingAddressErrors to be updated on payer detail change event?

I think we should allow it - just to reduce our (implementation) complexity. It's not different from a developer randomly invalidating their `form` elements. 




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