So the execution model is now even more similar to Go's one, with the M:N scheduling, IIUC?
I much like to hear that, as I found Crystal to provide pretty much exactly the same concurrency primitives as Go, but with a much nicer syntax, as I compared here:
Execution contexts closing in to being enabled by default is a big one. As is the io_uring based event loop that is also finally getting merged (even though that one is also hidden behind flags).