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

[fantasai]

On 05/04/2015 02:19 PM, Peter Edberg wrote:
> I have been checking with various groups at Apple. The consensus here is that we would like to see the linebreak value for
> halfwidth katakana changed to ID.

Do we want all halfwidth kana changed to ID, or should there
be some exception for the voicing marks (U+FF9E, U+FF9F) to
forbid breaks before?

~fantasai