This a bug? wp_link_pages

I am not sure if this is a bug or I’m using it incorrectly.

In wp_link_pages the option to have “next” instead of “number” doesn’t put any type of spacing between “Previous Page” and “Next Page” so it looks bad. The page ends up with <<Previous Page Next Page>> all squished together.

I added a new field called “between” into this function to allow it to put spaces — by default I set it to to 2 spaces but you could pass the option to have 3 spaces. It makes it much cleaner.

function wp_link_pages($args = '') {
        $defaults = array(
                'before' => '<p>' . __('Pages:'), 'after' => '</p>',
                'link_before' => '', 'link_after' => '',
                'next_or_number' => 'number', 'nextpagelink' => __('Next page'),
                'previouspagelink' => __('Previous page'), 'pagelink' => '%',
                'more_file' => '', 'echo' => 1, 'between' => '&nbsp;&nbsp;'
        );

I then put the code in the proper location in the function to only add the space if there is both a previous and next output. Should I raise a ticket on this and submit a fix?