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Rust isn't "thrown in", it's what Deno is built with.

No, Deno is built with V8, and V8 is written in C++.

V8 is the only C++ component of Deno. The other bits of the runtime are written in Rust, and Rust is the native extension language.

The "other bits" are the ones that don't matter.

It's like saying that a browser skin is "built on Rust" when inside it's still Webkit and Chromium.