Back in March, I wrote about JSSE, a JavaScript engine an agent built from scratch in Rust. It was correct, but slow. In May, I wrote about making it faster without touching its architecture, and promised that post was not about bytecode. JSSE v0.9.0 was tagged on September 23, so it is time to take stock. In this post, I will go through where JSSE stands six months after its first release, how it compares with other engines, and the guardrails that allowed an agent to make it faster without breaking it. The short version: v0.9.0 runs 47 of the...