I saw the quoted text in the original page and stopped reading right there; who on earth wants to use a query library where you have no idea whether what's returned is an array of elements or just an element?
Why would you have no idea? If you're querying by id, you have one, if you're querying by anything else, assume you have more. Once you assume you have more, you use each() to operate on all or only() to narrow the list. Those functions handle the abstraction for you, just like a jQuery wrapper does.