Re: [I18ndir] [art] Modern Network Unicode

[John C Klensin <[e-mail]>]

--On Wednesday, July 10, 2019 16:00 -0700 Asmus Freytag
<[e-mail]> wrote:

> On 7/10/2019 12:09 AM, John C Klensin wrote:
>> For the record, I do have one other concern.  The examples
>> above use extended Latin script.  Because of its NVT origins,
>> much of 5198 makes assumptions about that script or scripts
>> closely related to it.  If you are doing something for this
>> century and beyond, you should really think carefully about
>> the implications of scripts that are very different.
> 
> There are a few scripts where un-normalized text is
> "preferred" by the user community over NFC. In some cases, the
> most natural ordering of combining marks does not match NFC's
> canonical ordering. I other cases, NFC does not compose some
> sequences while local user communities strongly prefer the
> precomposed code points (e.g. Bengali).
> 
> Those scripts would be an exception to John's statement: " NFC
> is also a close approximation to what any sensible terminal
> driver or IME is going to produce natively from a plausible
> keyboard layout for the relevant script", a statement that
> otherwise holds well.

Indeed.   The explanation is also more detailed that I had time
for, and better than I would have written if I had tried, as to
why encouraging everything to be forced into NFC before
transmission is probably unwise.

    john