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

@alvestrand so do I understand it correctly that IDNA2008 doesn't take a stance as to whether all labels in a domain need to obey The Bidi Rule?

https://www.unicode.org/reports/tr46/#Validity_Criteria does which might explain the difference.

https://www.rfc-editor.org/rfc/rfc5891.html#section-4.2.3.4 seems to only enforce The Bidi Rule upon individual labels containing characters whose property is R whereas UTS46 enforces it upon all labels in a domain as long as CheckBidi is true.

I do think The Bidi Rule is somewhat confusing if that is the case as it itself states

> The following rule, consisting of six conditions, applies to labels
   in Bidi domain names.

which easily leads one to think it applies to all labels and has to be obeyed.

Also, it's not clear to me how from The Bidi Rule enforced only upon labels containing characters whose property is R the guarantee follows that labels starting with an ASCII digit do not come after the RTL label.

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