Index: default-filters.php
===================================================================
--- default-filters.php	(revision 15513)
+++ default-filters.php	(working copy)
@@ -38,7 +38,7 @@
 
 // Email saves
 foreach ( array( 'pre_comment_author_email', 'pre_user_email' ) as $filter ) {
-	add_filter( $filter, 'trim'           );
+	add_filter( $filter, 'trim', null, 1  );
 	add_filter( $filter, 'sanitize_email' );
 	add_filter( $filter, 'wp_filter_kses' );
 }
@@ -93,7 +93,7 @@
 // Format titles
 foreach ( array( 'single_post_title', 'single_cat_title', 'single_tag_title', 'single_month_title', 'nav_menu_attr_title', 'nav_menu_description' ) as $filter ) {
 	add_filter( $filter, 'wptexturize' );
-	add_filter( $filter, 'strip_tags'  );
+	add_filter( $filter, 'strip_tags', null, 1  );
 }
 
 // Format text area for display.
@@ -112,7 +112,7 @@
 // Display filters
 add_filter( 'the_title', 'wptexturize'   );
 add_filter( 'the_title', 'convert_chars' );
-add_filter( 'the_title', 'trim'          );
+add_filter( 'the_title', 'trim', null, 1 );
 
 add_filter( 'the_content', 'wptexturize'        );
 add_filter( 'the_content', 'convert_smilies'    );
@@ -143,7 +143,7 @@
 add_filter( 'wp_sprintf', 'wp_sprintf_l', 10, 2 );
 
 // RSS filters
-add_filter( 'the_title_rss',      'strip_tags'      );
+add_filter( 'the_title_rss',      'strip_tags', null, 1 );
 add_filter( 'the_title_rss',      'ent2ncr',      8 );
 add_filter( 'the_title_rss',      'esc_html'        );
 add_filter( 'the_content_rss',    'ent2ncr',      8 );
@@ -172,7 +172,7 @@
 add_filter( 'the_posts',            '_close_comments_for_old_posts'       );
 add_filter( 'comments_open',        '_close_comments_for_old_post', 10, 2 );
 add_filter( 'pings_open',           '_close_comments_for_old_post', 10, 2 );
-add_filter( 'editable_slug',        'urldecode'                           );
+add_filter( 'editable_slug',        'urldecode',                    10, 1 );
 add_filter( 'nav_menu_meta_box_object', '_wp_nav_menu_meta_box_object'    );
 
 // Atom SSL support
Index: plugin.php
===================================================================
--- plugin.php	(revision 15513)
+++ plugin.php	(working copy)
@@ -62,7 +62,7 @@
  * @param int $accepted_args optional. The number of arguments the function accept (default 1).
  * @return boolean true
  */
-function add_filter($tag, $function_to_add, $priority = 10, $accepted_args = 1) {
+function add_filter($tag, $function_to_add, $priority = 10, $accepted_args = null) {
 	global $wp_filter, $merged_filters;
 
 	$idx = _wp_filter_build_unique_id($tag, $function_to_add, $priority);
@@ -247,7 +247,7 @@
  * @param int $accepted_args optional. The number of arguments the function accpets (default: 1).
  * @return boolean Whether the function existed before it was removed.
  */
-function remove_filter($tag, $function_to_remove, $priority = 10, $accepted_args = 1) {
+function remove_filter($tag, $function_to_remove, $priority = 10, $accepted_args = null) {
 	$function_to_remove = _wp_filter_build_unique_id($tag, $function_to_remove, $priority);
 
 	$r = isset($GLOBALS['wp_filter'][$tag][$priority][$function_to_remove]);
@@ -321,7 +321,7 @@
  * @param int $priority optional. Used to specify the order in which the functions associated with a particular action are executed (default: 10). Lower numbers correspond with earlier execution, and functions with the same priority are executed in the order in which they were added to the action.
  * @param int $accepted_args optional. The number of arguments the function accept (default 1).
  */
-function add_action($tag, $function_to_add, $priority = 10, $accepted_args = 1) {
+function add_action($tag, $function_to_add, $priority = 10, $accepted_args = null) {
 	return add_filter($tag, $function_to_add, $priority, $accepted_args);
 }
 
@@ -507,10 +507,10 @@
  * @param string $tag The action hook to which the function to be removed is hooked.
  * @param callback $function_to_remove The name of the function which should be removed.
  * @param int $priority optional The priority of the function (default: 10).
- * @param int $accepted_args optional. The number of arguments the function accpets (default: 1).
+ * @param int $accepted_args optional. The number of arguments the function accepts (default: 1).
  * @return boolean Whether the function is removed.
  */
-function remove_action($tag, $function_to_remove, $priority = 10, $accepted_args = 1) {
+function remove_action($tag, $function_to_remove, $priority = 10, $accepted_args = null) {
 	return remove_filter($tag, $function_to_remove, $priority, $accepted_args);
 }