I disagree with the strong sentiment that nobody needs it. In fact, I can think of several situations where this would have been helpful. For example, "ids generated by each import/client/process are guaranteed to be sortable."

But in any case, this is such a simple spec and such an irrelevant feature thet this sounds very much like bikeshedding to me now. As such, please accept my apologies and do choose what is best for you.