[whatwg/fetch] How does request url differ from url list and current url? (#275)

The spec says the following:

* A request has an associated url (a fetch URL). 
* A request has an associated url list (a list of one or more fetch URLs). Unless stated otherwise, it is a list containing a copy of request's url. 
* A request has an associated current url. It is a pointer to the last fetch URL in request's url list. 

Shouldn't the first bullet "associated url" just be the first URL in the list?  Why are we storing this separately?

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