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**relay**: in a partial mesh, a node announces new heads to its neighbours, which pull
the changes they lack.
+**eager link** and **lazy link**: over a lazy link, changes are announced and pulled
+(the relay); over an eager one, a neighbour gets them as sync messages as soon as the
+other end applies them. A pull that brought changes makes a link eager in that
+direction, changes that came first another way make it lazy again (Plumtree's GRAFT and
+PRUNE).
+
**blob**: bytes too large for one message, fetched in chunks from several peers at once:
an epoch's snapshot change (for a rejoining node) or a remake's content (for voters).