[NNTP] AUTHINFO USER/PASS charset & canonicalization

[Clive D.W. Feather]

Russ Allbery said:
> At the least, we should move back from saying that these strings are in
> UTF-8 and instead just treat them as opaque byte strings, since in
> practice at those sites that aren't using strict ASCII now, they're not
> necessarily going to be UTF-8 (so saying that doesn't help backward
> compatibility).

It sounds like you need an Internationalisation Considerations section like
we did in the base document. No doubt some of the wording could be re-used.

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Clive D.W. Feather  | Work:  <clive at demon.net>   | Tel:    +44 20 8495 6138
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