Paul Hoffman wrote:

RFC 1035 and RFC 2181 are unclear about whether an RRset that is
required in a reply can be partial.

1035 is clear:

   - When several RRs of the same type are available for a
     particular owner name, the resolver should either cache them
     all or none at all.  When a response is truncated, and a
     resolver doesn't know whether it has a complete set, it should
     not cache a possibly partial set of RRs.

                                                Masataka Ohta

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