Bun is adding real shared-memory threads to JavaScript, and the PR description was written by Claude (github.com)
`new Thread(fn)` runs a closure on another OS thread inside the same heap, no postMessage, no structured clone, no SharedArrayBuffer. It implements a 2017 design that, until now, nobody had shipped.
Buried in the writeup: the garbage collector still stops the world. A VM-internals reader flagged it as the line that will wreck tail latency. Bun's creator, meanwhile, confirmed the whole PR description is Claude-generated.
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