This works, but it has a vulnerability: it hardcodes the native code string manually. If fermaw’s integrity check was especially paranoid and compared the spoofed string against the actual native code string retrieved from a trusted reference (say, by calling Function.prototype.toString.call(originalFunction) on a cached copy of the original), the manually crafted string might not match precisely, particularly across different browser versions or platforms where the exact whitespace or formatting of [native code] strings varies slightly.
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