Re: [whatwg/url] Refusing a mix of numeric-only and BIDI domains (#543)

This logic took quite a while to work out, including actually coding up the BIDI rule and running it through all the possible combinations of directions to make sure I had them all covered.....

The "bidi rule" in RFC 5893 section 2 applies to a single label. So a label (not a domain name) can either obey the rule or not.

The guarantees in the last two paragraphs are about the properties of a whole domain name. They are not part of the rule.

The practical consequence is that if you want sanity in your display, you can never have <RTL-label>.3com.com - because that would *probably* display as 3<RTL-label>.com.com, which is confusing.

So 1.ي should not be rejected, but 1.ي.3com should be. (inspect the order of the characters in that one!)








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