(a) such a change would not change the
number of strings or characters that can be registered at all:
only the base characters can actually appear in an IDNA string
post the ToUnicode(ToASCII(char)) operation pair
Interesting idea, but you may lose every chance to have a RHD/LHD common
support if you make it too simply. On the countrary it permits to have the
information to differentiate upper and lower cases if/when needed.
jfc