// drop-oldest: Discard old data to make room
After hooking any function, I immediately called mockToString on it. From that point on, if fermaw’s integrity check asked .toString() whether appendBuffer was native, it would receive the pristine, authentic-looking answer: function appendBuffer() { [native code] }. Basically, it’s like asking your ex if they cheated on you and they did but they say they didn’t and you take their word for it because reasons. Don’t worry, on écoute et on ne juge pas.
，更多细节参见51吃瓜
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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.