> prefer
> > a U-label? Also, I don't think you want to allow an FQDN that is a
> > mixture of U-labels and A-labels.
>
> I've read the relevant sections 5 times now. I think that you are
> right, U-label is what we're looking for. The fact that you _can_ mix
> label types, doesn't mean that you should.
Whoops, let me correct that after a sixth read. IDNA distinguishes between U-label and NR-LDH-label. If we only allow U-label, we can't use simple domain names like "example.com". The text becomes:
This <xref target="I-D.ietf-idnabis-defs">IDN-aware domain name slot</xref> is formed from any sequence of valid U-labels or NR-LDH-labels.
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