[Qwen Meetup] Function Calling Harness with Qwen, turning 6.75% to 100%

I was personally invited by the Qwen team to speak at Qwen Meetup Korea, and got to present locally here in Korea yesterday - pretty honored to have been reached out to directly. The talk was about how I got function calling to work reliably on deeply recursive union types - the stuff the industry generally says doesn't work. With qwen3-coder-next, first-try success rate was 6.75%. And the entire Qwen 3.5 model family was hitting 0% on union types due to a consistent double-stringify bug. Both ended up at 100.