How is the Bun Rewrite in Rust going?

Jarred Sumner of Bun announced a rewrite of the JavaScript runtime in Rust completed in 11 days using Anthropic's AI at a cost of $165,000, positioning it as proof of AI's coding capabilities. However, the author's investigation reveals concerning gaps: six weeks after the merge, no release has been tagged, and the number of open pull requests from the AI (Claude) has nearly doubled from 1,277 to 2,475, suggesting the "completed" rewrite may still require substantial work. The article questions whether the project's success is being overstated for marketing purposes given the large valuation claims tied to AI coding abilities.