Given all the recent press about bun rewriting 500k lines of zig into rust at a cost of $165K tokens of Fable in an 11 day sprint, would be super interested to hear about your experience and approach.
The first iteration was a rewrite using codex /goal but it ended up producing junk
The second iteration was fable controlling gpt-5.5 agents to write the code with really strong acceptance tests. This pushed the library in the right direction and is basically what you see here today