A free version is available here: rdcu.be/exUiD

Thanks again to the guest editors - and also to many who heard me present this in Munich, Shanghai, Taipei, Cardiff, and Birmingham.

I'm very grateful to the brilliant guest editors, @linyingtung.bsky.social, Kirk Michaelian, Shin Sakuragi, Chris McCarroll, and André Sant'Anna!

Thanks for contributing such a cool paper!

Most of all, thanks to the contributors for their excellent papers, clearly showing, I think, that this is a pressing and exciting area of research. I hope the papers prompt lots of further work!

This was very much a joint effort, so huge thanks to co-editors Kirk and Denis for their collaboration. We began discussing this in 2020-21, and held a conference on the topic in 2022. Great to see it finally out. Thanks as well to all who kindly reviewed.

A very enjoyable and interesting workshop here today - especially thanks to all the students who came with great questions