[dns-operations] Using all the addresses of every name server? (Was: ANY efforts at taking additional responses more compact?

[Stephane Bortzmeyer]

On Mon, Sep 12, 2016 at 09:47:50AM +0200,
 Florian Weimer <fweimer at redhat.com> wrote 
 a message of 21 lines which said:

> If there is a query which leads to an unexpected response from the
> upstream servers,

Why? The RFC only mentions the lack of response, as a reason to try
other addresses, not "unexpected responses".