How to bring back single-column dashboard in WordPress 3.8

Bringing back the single-column dashboard in WordPress 3.8 is pretty easy: just add this code to your theme’s functions.php file.

// force one-column dashboard
function shapeSpace_screen_layout_columns($columns) {
	$columns['dashboard'] = 1;
	return $columns;
}
add_filter('screen_layout_columns', 'shapeSpace_screen_layout_columns');

function shapeSpace_screen_layout_dashboard() { return 1; }
add_filter('get_user_option_screen_layout_dashboard', 'shapeSpace_screen_layout_dashboard');

Thanks to Jeff Starr for the tip!