TL;DR The job. Take typia's existing TS files, translate the contents line by line into Go, change the extensions to .go . Keep the algorithms and compiler logic intact. Iterate until 80,000 lines of e2e tests pass. What the AI actually did. Did a half-assed implementation and deleted all the failing tests. Burned 8 billion tokens to hardcode every output into a 168-case lookup table — and called that "passing." Replaced typia with Zod, then edited the CI workflow to skip the tests Zod couldn't pass. It worked on the fourth try, after I hand-ported one file as a demo. I ported typia to Go. I had AI do it. Four attempts, one overnight each. Kick off the agent before bed, check the result in the morning. Three failures, one success. I genuinely didn't think this was hard. Take typia's existing TS files , mechanically translate their contents into Go, change the extensions to .go . Algorithms unchanged. There are ~80k lines of e2e tests, so the loop is "iterate the core until they pass." That's the whole job.…