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TODO

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+ - zomp nodes must report the realms they provide to upstream nodes to which they connect.
+   On redirect a list of hosts of the form [{zx:host(), [zx:realm()]}] must be provided to the downstream client.
+   This is the only way that downstream clients can determine which redirect hosts are useful to it.
+
+ - The ZX daemon should be able to retry requests that were submitted but did not receive a response before the relevant
+   connection was terminated for whatever reason.
+   The most obvious way to do this would be to keep a set or queue of references in each connection monitor's section,
+   clearing them when they receive responses, and pushing them back into the action queue (from the responses reference map)
+   when they fail.
+
+ - The same issue as the one above, but with subscriptions. Currently there is no obvious way to track what subscriptions flow
+   through which connections, and on termination or change of a connection there is no way to ensure that the subscription request
+   finds its way back into the action queue to resubmission once a realm becomes available again.
+
+ - The request tracking ref list is currently passing through the MX record. That is exactly the wrong place to put it.
+   It should DEFINITELY be in the CX record.
+   MOVE IT.