This looks great - but now I'm wondering if perhaps we'd want to auto-shallow-render? ie, every time you .find, the nodes in a shallow-rendered collection are shallow-rendered. What would be the downsides?

I briefly considered this. This isn't actually as possible as it sounds. And would have many drawbacks IMO even if it was.

The main thing is that you may actually need to stub out a lot of things to dive into a complex component. And it also encourages people to test behavior that's not actually part of the component.

Further, it is unclear how this would work. The shallow renderer is meant to be rendering one thing at a time. If you ran .find(Bar) and ended up finding 10 Bar instances, there's no clean way right now to have a "wrapper" around all 10 of them.

Gotcha - in that case, this approach seems best.