Re: [w3c/payment-request] Add regionCode attribute (#690)

marcoscaceres commented on this pull request.



> +                      <li>Two <a>code points</a> that match an [[!ISO3166-1]]
+                      alpha-2 country code.
+                      </li>
+                      <li>A single U+002D (-) <a>code point</a>.
+                      </li>
+                      <li>One, two, or three <a data-cite=
+                      "INFRA#ascii-alphanumeric">ASCII alphanumeric</a> code
+                      points, in any order.
+                      </li>
+                    </ul>
+                  </div>
+                </li>
+                <li>Set <var>address</var>.<a>[[\regionCode]]</a> to
+                <var>regionCode</var>.
+                </li>
+                <li>Let <var>region</var> be the corresponding <a>country

I guess it does also remove a source of ambiguity/redundancy, as `.country` will now need to be there to derive `.region`. Do we still attempt to do validation on a synthetic 3166-2 code? I would guess no: we attempt to populate `region` iff `county` and `regionCode` are both there and they both together form a known 3366-2 code. Can work with that. 

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