Hello !
I wanted to use .localhost TLD, however code seems to be "do not propagate to DNS"
It seems RFC 6761 has a special section for .localhost TLD, which basically say to answer with IP loopback (ie 127.0.0.1)
My understanding is that replacing server=/localhost/ with address=/.localhost/127.0.0.1 would do the trick.
Would you want a PR on this (I'll need to work out how to test it too 
)?
Thanks a lot for any answer 