It turns out that volume of training data isn't the most important thing. Elixir beats Kotlin and C#, which beat pretty much everything else. Kotlin is probably the sweet spot for most things.
Kotlin has the combination of JVM ecosystem, overall good performance and agents are good at writing it. I'd argue that it's a better default choice to reach for when working on non-frontend code than Go, though Rust and Python still have use cases.