Mike Wallner is sharing a quick note in this new blog post about some "weirdance" he noticed while working with libcurl and cookies.
I had to implement some changes which are only in CVS for now. Beware that all this does not affect custom cookies set with HttpRequest::setCookies() and HttpRequest::addCookies(). Custom cookies can always be unset by calling HttpRequest::setCookies().
He's made these adjustments in the CVS for the library, and mentions an implementation of the cookiestore option with these new changes as well.