Re: [whatwg/url] Support IPv6 zone identifiers (#392)

Good catch. RFC4007 says nothing about case (in fact, it says nothing useful about the Zone ID string at all). Running code (a.k.a. ping on Linux) tells me that implementations are case-sensitive, which is of course the implication of saying nothing.
That sentence "The host subcomponent is case-insensitive." is tricky. It's appropriate when applied to a plain IPv6 address, since the hexadecimal characters are indeed case-insensitive anyway.  It's inappropriate when applied to a Zone ID string. I think we'll have to live with it, though, and restrict the format to lower case Zone IDs. I'll take this question to the IETF WG list.


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