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

> The point is that no single entity can make that guarantee, as described in section 5.

So why say they are guarantees?

Given that IDNA2003 was implemented by user agents it does seem somewhat irresponsible that IDNA2008 didn't try to address them at all, but I guess that's water under the bridge.

I guess I need input from @achristensen07 @valenting @markusicu @macchiati as to what exactly we'd like to enforce here. Banning numeric labels in domains containing RTL labels seems bad so I assume we want to change that part of UTS46.

Enforcing The Bidi Rule for labels containing a character whose property is R seems realistic and implemented by all user agents.

We could additionally try to enforce the second "guarantee" by not allowing a numeric label after an RTL label, but not sure.

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