trailing slash misdirects resource controller

when specifying a resource route according to the user guide:

PHP Code:

$routes->resource('photos'); 


the create() controller method is correctly called when POSTing data to /photos, however when a trailing slash is added /photos/ the index() controller method is called instead


adding a route like

PHP Code:

$routes->post('users/', 'Users::create');
$routes->resource('users'); 


before the resource route doesn't help