Re: [whatwg/url] Reject non-numeric hostnames that end in numbers. (#619)

@TimothyGu commented on this pull request.



> +
+ <li>
+  <p>If the last <a for=list>item</a> in <var>parts</var> is the empty string, then:
+
+  <ol>
+   <li><p>If <var>parts</var>'s <a for=list>size</a> is 1, return false.
+
+   <li>Otherwise, <a for=list>remove</a> the last <a for=list>item</a> from <var>parts</var>.
+  </ol>
+
+ <li><p>Let <var>last</var> be the last <a for=list>item</a> from <var>parts</var>.
+
+ <li>If parsing <var>last</var> as an <a lt="IPv4 number parser">IPv4 number</a> does not
+ return failure, return true.
+
+ <li><p>If <var>last</var> is non-empty and contains only <a>ASCII digits</a>, return true.

Maybe mention in a note we could get here for _last_ = "`09`", because IPv4 number parser would treat it as octal?

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