Jarred Sumner used dynamic workflows to port Bun from Zig to Rust with 99.8% of the existing test suite passing, roughly 750,000 lines of Rust, and eleven days from first commit to merge.
750,000 lines of Rust in 11 days is a genuinely remarkable benchmark โ a large-scale language port that would typically occupy an experienced team for 6-12 months. The 99.8% test pass rate is the critical credibility signal: it suggests the agents were doing semantic translation, not just syntactic conversion.