> But what about doctests? They are run unconditionally.

Sorry, I don't know how to handle them. I only tried to make a small enhancement for my "bisect" usecase. If you see a way to handle them, don't hesitate to propose a patch!

I would prefer to have time to play with the new feature before backporting it to stable branches. If someone needs this feature right now in stable branches, speak up and maybe also reopen the issue ;-)

My change was merged (with unit tests!), so I close the issue.