This is what I suspected: Rust zealotry. We are searching for a string. Language matters to the guy writing it but the user? Nah. There's no security hole here.
Who's the zealot here? The guy who doesn't want to risk and openly states so, or the guy proclaiming there's no risk, even with ample historical evidence for the opposite?
I don't accept your labeling, especially when it's so egregiously misguided.