If we have a payment request that has option: {requestPayerEmail: false}, then what should we do if the merchant asks to correct something that was not requested, like

response.retry({payer: {email: "Lol, I never asked for your email."} })

Right now, the spec just says to ignore that. Should we maybe throw or just continue to ignore. The above also applies to some cases of .updateWith() (e.g., flagging shipping address errors when no shipping address was requested).

cc @aestes, @rsolomakhin, @romandev.