Put some more logging in CoreDNS.
Add a test for SkyDNS': https://github.com/skynetservices/skydns/issues/217 Put the CNAME in front for both answer and extra sections. Note that the etcd middleware seems to already to the correct thing though.
This middleware allows you to round robin a/aaaa records in a reply and maybe more in the future (i.e.) sort a packet?