Re: [whatwg/url] Define domain label (#435)

The definition by [UTS #46](https://www.unicode.org/reports/tr46/#Notation) seems quite relevant:

> In this document, a <em>label</em> is a substring of a domain name. That substring is bounded on both sides by either the start or the end of the string, or any of the following characters, called <em>label-separators</em>:
>
> 1. U+002E ( . ) FULL STOP
> 2. U+FF0E ( ． ) FULLWIDTH FULL STOP
> 3. U+3002 ( 。 ) IDEOGRAPHIC FULL STOP
> 4. U+FF61 ( ｡ ) HALFWIDTH IDEOGRAPHIC FULL STOP

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