Well it's what you'd want but not what it does, for one, but for another: comparing scalars is very easy, comparing complex structures is not. To compare one array with another you'd need to iterate over each element, recursively.
That JavaScript handles arrays as objects is also not bad, that's just a language feature that you may like or not, not much can go wrong there. The reassignment of "this" or how JS handlesnumber comparison, yeah, that is infuriatingly bad