On Feb 21, 2015, at 11:22 PM, Måns Nilsson <[email protected]> wrote:
> Non-ASCII characters then probably should be encoded using IDNA.

Not at all. Assuming that you meant "Punycode" for "IDNA", that encoding is 
used for full labels, not characters. The result of this is that, if the master 
file format is ASCII, names would be encoded Punycode. It is important to *not* 
require IDNA2003 or IDNA2008, which have different prohibitions on different 
characters. A second result is that anything other than domain names that might 
have non-ASCII characters needs to be encoded in Base64.

> (comments
> can of course be anything that does not interfere with reading of the
> file, like NULL.

Proposal: comments not be allowed in the canonical format. This will allow more 
likely interoperability.

--Paul Hoffman

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