The interpretation of whether a partial RRset is allowed by 1035/2181 made by JohnL, PaulV, and MukundS are all plausible and conflicting. RFC 1035 and RFC 2181 are unclear about whether an RRset that is required in a reply can be partial.
draft-ietf-dnsop-glue-is-not-optional as it stands is probably not the best place to update the understanding of the standards-level relationship between partial RRsets, the TC bit, and what parts of a response are required. Doing so is adventurous, time-consuming, and will almost certainly cause multiple current implementations to be out of compliance. It is probably still worth doing, albeit carefully. A bad outcome would be finishing the document due to exhaustion instead of consensus. --Paul Hoffman
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