Re: [whatwg/url] Forbid < and > in hosts (#458)

I have three concerns:
0. Are there any real registered domains with '*', '^', '|', or '"' in them?  I imagine there are rules somewhere in ICANN preventing this, but it would be good to reference them.
1. What led to these characters being forbidden in Gecko?  Will we want to change this set of forbidden characters again after this?
2. Are there any URLs with custom schemes with those in their host?  This is harder to find out. I hope the compatibility risk is minimal but I don't have a good way to find out except changing it and seeing which things break.  This is also a nudge to Chrome and Firefox to implement hosts in URLs with custom schemes according to the spec.


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