The point of this website isn't to mock software that has bugs - it's to show pitfalls that have been fallen into before, and could be fallen into again. If popular languages have encountered them in the past, and fixed them, why not document it? Helps people in the future. Sure, actual examples of pure unsoundness are more interesting, but creating unsoundness in what should be a sound system is also useful to implementers of these sorts of systems.
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