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

stpeter 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

Although I'm always hesitant to parse other people's strings, ISO 3166-2 is defined to use ISO 3166-1 alpha-2 code elements as the first two characters of the string, followed by the hyphen character, followed by the region itself. So I _think_ we'd be safe in truncated the first three chars.

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