[whatwg/url] http://40000000000 considered as being a wrong URL (#436)

I recently opened an issue in https://github.com/nodejs/node/issues/27093 concerning the fact that http://40000000000 was considered as being an invalid url while RFC-1123 clearly states the opposite.

And got redirected here :) 

According to RFC-1123, which defined what is an URL, the URL is valid. 

Indeed, RFC-1123 states:

> The syntax of a legal Internet host name was specified in RFC-952 [DNS:4]. One aspect of host name syntax is hereby changed: the restriction on the first character is relaxed to allow either a letter or a digit.

More http://www.faqs.org/rfcs/rfc1123.html

With RFC-952 stating:

> `<domainname> ::= <hname>`
> `<hname> ::= <name>*["."<name>]`
> `<name> ::= <let>[*[<let-or-digit-or-hyphen>]<let-or-digit>]`

More http://www.faqs.org/rfcs/rfc952.html

On their side both `curl` and `ping` (at least in Windows) consider the domain `40000000000` as being a valid domain.

To my understanding of node's code and of the spec, the issue, if confirmed, comes from the fact that this domain is considered as an invalid IPv4.

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