I now think that it should go back to the binary yes and no responses, adding bells and whistles will complicate things too much.
At least ternary: an “unsure” option is definitely worth including. (That also seems to be the third most popular option in the questions above.)
I think a fourth option, for “the question is wrong” would also be a good one, but perhaps redundant if there is also a comment section.
I now think that it should go back to the binary yes and no responses, adding bells and whistles will complicate things too much.
At least ternary: an “unsure” option is definitely worth including. (That also seems to be the third most popular option in the questions above.)
I think a fourth option, for “the question is wrong” would also be a good one, but perhaps redundant if there is also a comment section.