Crystal 1.20.0 Is Released

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:

https://livesys.se/posts/crystal-concurrency-easier-syntax-t...

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).

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