This seems like a useful addition. I hope it will gain traction (if the impl is sober, I haven't tried it out yet). My main issue with backbone are the Collect

This seems like a useful addition. I hope it will gain traction (if the impl is sober, I haven't tried it out yet). My main issue with backbone are the Collection shortcomings (like this one) which require just the kind of boilerplate-workarounds that are so easy to get subtly wrong. Another example would be the lack of infrastructure for nested Collections (e.g. cf. https://github.com/documentcloud/backbone/issues/483#issuecomment-1595018 https://github.com/documentcloud/backbone/issues/483#issueco...). I understand that backbone doesn't want to grow fat in the core. However it would be nice to see a standard library emerge to cover these very common requirements (perhaps call it "ribcage"?).