Good point. I guess usually crops up when I've already got a predicate function handy and I want to say `all(items, f)`. I always just expect that to work for some reason. Using a generator expression works just as well, though, and is probably clearer in the long run.

Besides, I guess if `any` had a signature like

    def any(xs, pred=lambda x: bool(x))

or something, that would reverse the signatures of map, filter, reduce, etc.

On that note, I always want the arguments of filter and reduce, but not those of map, to be reversed for some reason.