>If rewrites are so easy, why not rewrite CC in a native language? Would’ve been a hell of a lot cheaper.

Yeah, good question. OpenAI decided to rewrite Codex in Rust about a year ago[0].

In fact, since rewrites are that easy, what do we need Bun for? Why doesn't everybody just port all of their Javascript code into Rust?

[0] https://github.com/openai/codex/discussions/1174