[georgemcbay]

The premise of this article is that Javascript's pure dynamic variables lead to slowness.

I'm not sure what your point with this post was because if you litter your C/C++ code with non-static casts, it is also going to be much slower than code without casts.

[ootachi]

The parent comment was pointing out that there exist programs in JavaScript in which the types cannot be inferred. All I was saying was that this is not unique to JavaScript, or to dynamically typed languages generally.