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Changes between Version 1 and Version 2 of Ticket #22256

-                      v1
+                      v2
+Currently, callbacks passed to add_action() and add_filter() are already sort of namespaced by the hook name, by the callback itself, by priority and by argument count.
+You need to know all of them in order to use `remove_action()` successfully.
+Currently, callbacks passed to add_action() and add_filter() are already sort of namespaced by the hook name, by the callback itself, by priority and by argument count. You need to know all of them in order to use `remove_action()` successfully.
 Acquiring the callback is especially problematic when it's:
 …
+}
 add_filter( 'parse_query.p2p', function() {
+add_filter( 'posts_clauses.p2p', function( $clauses ) {
   // do stuff
+}