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Tony Jolliffe BBC
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These optimizations are difficult to implement, frequently error-prone, and lead to inconsistent behavior across runtimes. Bun's "Direct Streams" optimization takes a deliberately and observably non-standard approach, bypassing much of the spec's machinery entirely. Cloudflare Workers' IdentityTransformStream provides a fast-path for pass-through transforms but is Workers-specific and implements behaviors that are not standard for a TransformStream. Each runtime has its own set of tricks and the natural tendency is toward non-standard solutions, because that's often the only way to make things fast.
Running a container in privileged modeThis is worth calling out because it comes up surprisingly often. Some isolation approaches require Docker’s privileged flag. For example, building a custom sandbox that uses nested PID namespaces inside a container often leads developers to use privileged mode, because mounting a new /proc filesystem for the nested sandbox requires the CAP_SYS_ADMIN capability (unless you also use user namespaces).
I’ve been using the Beeper chat consolidation app since I learned about it shortly before it blew up in tech news. It helps me in a couple of ways. It enables me to use Facebook, Instagram, LinkedIn, X, and Discord direct messaging on my phone without having any of those apps installed. And it allows me to easily get Signal and WhatsApp messages across multiple devices, despite both services’ limited multidevice support.