Re: [w3c/payment-request] Standardize phone number format (#652)

While I understand the issue with edge-cases in E.164, I'm concerned about the spec being so broad that the resulting numbers become unusable. The example from @aestes above has a US number with special formatting (no big deal) but also no country code (big deal!). The form in which a phone number is presented to a user has meaning in the context of their system's locale settings and their own knowledge of what country their phone number is for. If that same user-facing value is passed as-is to a merchant, it may be misinterpreted. Can we at least require numbers to include country code?

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