I know that IPv6 does not exist in the real world ;-)
[according to my ISP] - but when David Laight fixed miniroot problems
for non i386 archs today, it was pretty obvious that we do not offer IPv6
on a lot of archs during installation.

Some archs may not want to do it due to size constraints, but the current
choise seems arbitrary.

Don't we want to offer IPv6 on install media on any arch where size
(or other constraints) do not prevent it?

Martin