Re: [idn] Fwd: Slash-like mark problem

["Adam M. Costello" <idn.amc+0@nicemice.net.RemoveThisWord>]

I wrote:

> Here is my straw man proposal from three years ago:

That proposal proposed to alter ToASCII back when it was still being
developed.  It's too late for that now.  If this Unicode category filter
is resurrected, it would have to be used differently than I originally
envisioned.  It would have to be used to deprecate, but not disqualify,
some IDNs from use as host names,

For example, we could say that domain names containing characters
outside classes L, M, N, and hyphen-minus should not be used as host
names (which implies that they should not be used in URIs, IRIs, and
email addresses), but if they are used as host names, applications must
honor them but should display them in ASCII form or in some sort of
warning mode.

AMC