[XMLHttpRequest] withCredentials=false and returned cookies

In http://www.w3.org/TR/XMLHttpRequest2/#credentials, it
says: "The credentials flag ...indicates whether a non same origin request
includes cookie and HTTP authentication data...during the send() algorithm."

If withCredentials is false, it seems like the cookies returned from the
request shouldn't be stored either, but I couldn't find mention of this.
(Why should the cookies returned from this be stored and possibly interfere
with same origin requests, especially if the cookies aren't being sent?)

Is this true?

thanks, dave