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It could be. Rust has been stable Real Soon Now for quite some years.

"Stable" is not a binary condition, and Rust has been moving continuously in a 'more stable' direction.

I'm not sure I agree with that. Async/await is a major new feature and is just landing now.

Python is over 20 years old and got async/await only 4 years ago. I think most people would still consider Python a fairly stable language.