`block_all` -> `default`

proposals/4380-invite-blocking.md

@@ -17,7 +17,7 @@ significantly cut down.
 
 A new account data event `m.invite_permission_config` is introduced.
 
-The content has a single property, `block_all`. When set to `true`, that
+The content has a single property, `default_action`. When set to `block`, that
 indicates that the user does not wish to receive *any* room invites, and they
 should be blocked as described below. Any other value (including omission of
 the property) means that the user wants to receive invites as normal (subject
@@ -78,6 +78,12 @@ something important.
   useful. On the other hand, by rejecting invites as early as possible, we
   provide better protection to the servers.
 
+* An earlier draft of this proposal had a boolean property `block_all` instead
+  of `default_action`. We moved away from this to allow future expansion to
+  alternative actions such as *ignoring* rather than *blocking* invites (see
+  [MSC4283](https://github.com/matrix-org/matrix-spec-proposals/pull/4283)) as
+  well as overrides based on particular conditions.
+
 ## Security considerations
 
 None.