Is there any hard evidence that bipolar folk, on average, are smarter than normal people?

I have often been told that it’s the high IQ disease, but I am skeptical. If it’s anecdotal evidence, there’s room to be wrong. I don’t know if anyone has done a survey that identified how many people are bipolar and what their intelligence is. Too many problems. People might not know they are bipolar. They might be misdiagnosed. They might not want to report their condition. To find a random sample of sufficient people willing to undergo medical and psychological testing would be difficult and very expensive.

But I could be wrong. Perhaps there is hard evidence. Have you seen any?