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What an interesting perspective on Ruby async, the I/O multiplexing example was quite faschinating to see aswell
Gotta give credit for wonderfully clear writing. You can tell a person understands what they're saying by how well they express it. Reads smooth, and makes me see the author's mental model.

As far as substance: I love ruby libraries that allow you to simply "insert any ruby code". Many libraries tell you to call specific declarative functions, but I think Ruby shines at letting you use Ruby, instead of some limited subset of it. Examples of not-great approaches (imo) are libraries that try to take over how you write code, and give you a special declarative syntax for runtime type checking, building services out of lambdas, composing functions. Ruby's async is an example of "just insert any ruby in here". You can build runtime type checking the same way — allow people to check the value with any ruby code they like. Essentially, I agree with author's sentiment, and wish more people appreciated the beauty of this approach.

Mmmm...

I find it somewhat ironic that you pitch this as "No callbacks. No promises. No async/await keywords. Just Ruby code that scales."

When you literally show in the example right above that you need both an "async do" and a "end.map(&:wait)".

I'll add - the one compelling argument you make about needing a db connection per worker is mitigated with something like pgbouncer without much work. The OS overhead per thread (or hell, even per process: https://jacob.gold/posts/serving-200-million-requests-with-c...) isn't an argument I really buy, especially given your use case is long running llm chat tasks as stated above.

Personally - if I really want to be fast and efficient I'm not picking Ruby anyways (or python for that matter - but at least python has the huge ecosystem for the LLM/AI space right now).

"these microseconds add up to real latency"

While I love Ruby, if performance is your main motiviation, you would not be using a scripting language.

Python and Ruby developers discovering what was standard on Javascript a decade ago.

*yawn*

Imitation is the sincerest form of flattery, at least.