Mention if save( $file ) updates name used in construction

On man page at

        $cookie_jar->save( $file )
           This method file saves the state of the $cookie_jar to a file.  The
           state can then be restored later using the load() method.  If a
           filename is not specified we will use the name specified during
           construction.  If the attribute ignore_discard is set, then we will
           even save cookies that are marked to be discarded.

mention if this is exactly the same as just

open(my $ckf, ">", $file);
print $ckf $cookie_jar->as_string;
close $ckf;

or if it updates the name used during construction.

I.e.,

         $cookie_jar = HTTP::Cookies->new(
           file => "$ENV{'HOME'}/lwp_cookies.dat",
         );
        $cookie_jar->save( ); #Saves to "$ENV{'HOME'}/lwp_cookies.dat"
        $cookie_jar->save( $file ) #Saves to $file
        $cookie_jar->save( ); #man page not clear about now where this will save to

Start with the save() section of the HTTP::Cookies man page and compare its wording with the documented constructor filename and examples. Clarify whether calling save($file) changes the destination used by a later save() call; done when the no-argument behavior after an explicit filename is unambiguous.