One interesting implementation detail is that this product is itself implemented as a worker. We're finding that the Workers platform is the easiest way to build first-party Cloudflare features.

Yes, we will. This is something we built internally and we'll talk about architecture at some point.

Thank you! Lots of super cool stuff coming out of CF these days, the pace is hard to keep up! Not that it's a bad thing necessarily :)

I was wondering if it is lazily replicated to PoPs via KV gets. Would be interested in clarification on that though.

At present, yes, lazy propagation. But we're also exploring ways to do proactive propagation where desirable.