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

Hello

Some time ago I was trying to figure out if the domains below were rejected by the Rust url crate, it is tracked [here](https://github.com/servo/rust-url/issues/489). It seems this is maybe accidentally disallowed by the standard. I was recommended to raise it here.

It's a bit old so I don't remember the exact details and would have to dig them up, I tried to describe it in [this comment](https://github.com/servo/rust-url/issues/489#issuecomment-541111172). I think the issue was the combination of numeric only label and BIDI label.

Now, my question is, should these be valid URLs? They certainly are valid *domains*, even though it might be discouraged to allow them and the URLs are (were at least when it was reported; I could provide new ones if needed) alive and reachable. Note that they are considered malware URLs, so be careful when handling them.

```
Parsing failed: invalid international domain name, http://mail.163.com.xn----9mcjf9b4dbm09f.com/iloystgnjfrgthteawvo/indexx.php
Parsing failed: invalid international domain name, http://shdedgelanimailnoticeborad.count.mail.163.com.xn----9mcjf9b4dbm09f.com/sitemap.html
Parsing failed: invalid international domain name, http://count.shdedgelanimailnoticeborad.count.mail.163.com.xn----9mcjf9b4dbm09f.com/bvv
Parsing failed: invalid international domain name, http://count.shdedgelanimailnoticeborad.count.mail.163.com.xn----9mcjf9b4dbm09f.com/index.php
Parsing failed: invalid international domain name, http://count.shdedgelanimailnoticeborad.count.mail.163.com.xn----9mcjf9b4dbm09f.com/iloystgnjfrgthteawvo/index.php
```

-- 
You are receiving this because you are subscribed to this thread.
Reply to this email directly or view it on GitHub:
https://github.com/whatwg/url/issues/543