I've decided to go with N/A resolution.
I do think it is a strength of Manifold that markets can be resolved according to the commonsense interpretation of a question even in the face of annoying technicalities, but in this case:
-The issue here wasn't just an annoying technicality, but something where several people had reasonable arguments that it was a straightforward and obvious resolution.
-I did not adequately clarify in advance how I would deal with what I perceived as ambiguous situations.
-Multiple people suggested resolving N/A, or said they would consider resolving to 80% dishonorable.
I apologize for the insufficiently detailed market criteria. I have added more details to some of my existing markets, and in the future I will lean more toward rules-as-written or N/A resolution in case of ambiguity.
Happy Petrov Day