[bind10-dev] should we omit authority/additional sections in type-DS answers?

[JINMEI Tatuya / 神明達哉]

While working on http://bind10.isc.org/ticket/1570, I've noticed one
minor difference about answers to type-DS queries between BIND 9 and
other implementations:

- dig @f.root-servers.net com ds has empty authority/additional sections
- dig @[ai].root-servers.net com ds has authority/additional sections
  for the root zone

I believe F is BIND 9, and A and I are some different implementations.

BIND 9's behavior seems to be based on this change:

2678.	[func]		Treat DS queries as if "minimal-response yes;"
			was set. [RT #20258]

I've checked the #20258 ticket, but it was not clear whether it's a
result of operator's request or implementor's perception.
Implementing the same functionality shouldn't be difficult, and it
seems to have some point, but at the same time doing something special
for a particular type of queries makes the implementation more
complicated and more difficult to understand/maintain (even if
slightly).

So I have a question: do people want to have the compatible behavior
as BIND9 for BIND 10?

---
JINMEI, Tatuya