announcements answered when lacking

A neighbour now answers an announcement only if it lacks some of the
announced heads.  Heads that merely differ are no longer enough, since
they do while writes go on.  The check reads the document, so it runs
off the message consumer, as the pull check already does.

1 files changed, 2 insertions, 2 deletions

diff --git a/src/transport/mod.rs b/src/transport/mod.rs
index e27ce2d..17d6d4c 100644
--- a/src/transport/mod.rs
+++ b/src/transport/mod.rs
@@ -203,8 +203,8 @@ pub(crate) struct Status {
     /// recipient holds it dormant at once, rather than after `dormant_after` of silence.
     pub(crate) leaving: bool,
     /// The sender announces new heads (`swarm::relay`), rather than keeping alive: a
-    /// STATUS answered only if the recipient's heads differ. Most announcements reach a
-    /// neighbour that has the changes already, which has nothing to tell.
+    /// STATUS answered only if the recipient lacks some of the heads. Most announcements
+    /// reach a neighbour that has the changes already, which has nothing to tell.
     pub(crate) announcing: bool,
     /// Whom the sender reaches (`swarm::reach`): the pair keys (`topology::pair_key`)
     /// of the members it has an active session with that answer, sorted. In keepalive STATUSes and