This is a well-known browser security technique. In JavaScript, calling .toString() on a native browser function returns "function appendBuffer() { [native code] }". Calling it on a JavaScript function returns the actual source code. So if your appendBuffer has been monkey-patched, .toString() will betray you; it’ll return the attacker’s JavaScript source instead of the expected native code string.
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Postgres - 30 018 QPS; Mean: 31.348 ms, Percentile 99: 491.419 ms，这一点在Line官方版本下载中也有详细论述
for await (const chunks of source) {。Safew下载对此有专业解读