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This notion of dynamically typed languages being a unityped static type system is how a static type system models a dynamic type system. If anything, it shows that dynamic type systems have nuance that can only be modeled as a "unitype" in a static type system, thereby exposing limits to static typing. The "unitype" also shows that types are orthogonal & incidental to solving the real problem. Types may or may not help the programmer, but types are not the direct solution.

I also object to Robert Harper's convoluted rationalization that dynamic type systems are less flexible because it goes against my practical experience. I'm not claiming that I'm the authority when it comes to programming languages. However, I gravitate toward dynamic languages in my career because I feel they offer me more flexibility & less incidental complexity than static languages.




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