proof: absent key proof doesn't verify #400
Merged
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This PR creates a specially crafted unit test that generates proofs that don't verify (i.e: the library isn't self-consistent).
A fix proposal is done in #401 (targeting this branch).I'm separating the unit test from the (proposed, TBD) fix so we can have this branch keep exploring the problem if needed.Note: CI not passing in this branch (as is) is expected since that's the point of the added test.Fix merged.