The hidden cost of promises
As navigator, Lovell took with him a sextant to take star readings - in case the computers failed and they had to find their own way home.
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To achieve usable performance, every major runtime has resorted to non-standard internal optimizations for Web streams. Node.js, Deno, Bun, and Cloudflare Workers have all developed their own workarounds. This is particularly true for streams wired up to system-level I/O, where much of the machinery is non-observable and can be short-circuited.