Why doesn't Ideographic (ID) in UAX#14 have half-width katakana?

[fantasai]

On 08/20/2015 08:18 AM, Koji Ishii wrote:
> Right, this should be applied to only where currently AL.
>
> The basic idea is that, full width is a concept to use a character in an "imported" manner and thus different characteristics
> are applied, while half width is a concept of saving screen real estate and/or for legacy cultural usages so the
> characteristics should be the same as its full width counterpart, except the width.

This sounds good to me. Let me know if the UTC wants an official
CSSWG resolution of support on this change, I can arrange for
that if necessary.

~fantasai