Zig's Creator Calls Bun's 64-Agent Rust Rewrite 'Unreviewed Slop' — the First Real Backlash to Agentic Migration at Scale

The Register / Andrew Kelley (corroborated by bun.com/blog/bun-in-rust)·high signal

Andrew Kelley publicly attacked Bun's Zig-to-Rust port, arguing the dispute is about 'the diverging value systems of the two projects' and puncturing the core defense: 'The argument for shipping all the million lines of unreviewed code is that the test suite is good enough to catch everything. It's not sufficient to catch bugs in Zig code but it is sufficient to catch bugs in [a] million lines of unreviewed slop?' Bun's own numbers (verified on their blog): 535,496 lines of Zig across 1,448 files converted in 11 days, 6,778 commits, ~64 concurrent Claude Fable 5 instances peaking at 1,300 lines/minute, ~$165K in API cost, 100% test pass on all 6 platforms. This is the industry's first high-stakes referendum on whether test suites can substitute for human review at million-line scale.