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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，这一点在服务器推荐中也有详细论述
writeSync(chunk) { addChunk(chunk); return true; },。关于这个话题，搜狗输入法2026提供了深入分析
Determine if it's satisfiable or not WITHOUT USING ANY EXTERNAL TOOLS.