This function should absolutely NOT be a package. The problem is that JS has a very minimal standard library and despite tons of money going into the system, nobody's had the good sense to take a leadership role and implement that standard. In other languages you don't need to include external packages to determine the types of objects you're dealing with, or many other things.
And there's an interesting discussion to be had if it shouldn't be one of those snippets that everyone copies from Stackoverflow instead. And how much trouble in other ways that alternative has caused.
