I tend to agree that `?` methods should return Booleans. I should have looked more closely at the return value before merging so quickly. 

I'm beginning to wonder if this should be the default behavior for all `GET` calls. Asking consumers to handle `Octokit::NotFound` seems heavy handed. Then we could have the `?` variations check for truthiness. It would be a big change but might make the developer experience more pleasant. Thoughts?