Speaking of The "isanswered" search option isn't working as described, copying the relevant part from an old bug report of mine on Ask Ubuntu Meta;
isanswered: yes/true/1 returns only questions that have at least one positively-scored answer; no/false/0 returns only questions with no positively-scored answers.
isanswered:0 returns both questions and answers.
When I'm searching using
isanswered:0, according to the description, I'd expect to see only questions in the results, not answers.
While I agree that since answers can't have answers answers technically fit the criterion, perhaps it would be more reasonable if
isanswered:0 returned only questions.