More notes

syndicate/HOWITWORKS.md

@@ -460,7 +460,12 @@ check followed by zero or more (move, check) pairs.
 
 Care must be taken when applying entire *patches* to ensure that added
 assertions are processed before removed assertions; otherwise, actors
-will observe glitching in certain cases.
+will observe glitching in certain cases. For example, consider an
+endpoint with a wildcard subscription `[_]` and a separate endpoint
+asserting `[3]`. If a patch atomically replaces `[3]` with `[4]`, then
+if the removal is processed first, it will briefly appear to the `[_]`
+endpoint as if no assertions remain, whereas if the addition is
+processed first, no glitch will be detected.
 
 **Definition.** The procedure `sendMessage` delivers a message `v` to
   event handlers in the given index.
@@ -539,6 +544,11 @@ interested in the `present` constructor.
       endpoint of the other endpoint, even though you might expect the
       relayed assertion to do so.
 
+ - there's more to say about the implementation of the *dataspace*
+   itself, not just the index structures. For example, the care that
+   must be taken regarding `cleanup-changes` and abandoning work
+   during exception handling.
+
 <!--
 
 # Example expansions