>Resolvers check signatures on records they're going to ignore?
>That seems odd,
>although I suppose it's been a corner case that's not well tested.

There are two aspects here:
- A resolver may receive a DELEG record in the answer section. For example
  as a result of query for the DELEG type.
- DNSSEC validation resolvers can cache DNSSEC valid RRsets. For example,
  the resolver may not need a DS RRset right now. But it can update it's
  cache when it gets one and use it during validation.

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