I agree with @oskarwiksten (as I also commented last time this suggestion came up). It will be all to easy to misinterpret the meaning of this method. Why not be clear when we have a chance?
`anyUndefined` is unambiguous, or `anyNull`, but just `undefined` is not.

I'd really recommend that we make the distinction between by using `all` and `any` when we deal with multiple arguments.