PHP strict errors with list-pages-shortcode

After upgrading to WP 3.6.1 and running with WP_DEBUG true I began to get an error associated with list-pages-shortcode. There was a complaint that a subclass function definition did not match the parent class.

I would recommend that you change list-pages-shortcode.php line 153 to:

function start_el( &$output, $page, $depth = 0, $args = array(), $current_page = 0 ) {

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