+* Added formatversion to format=json, still experimental.
+* (T73020) Log event details are now always under a 'params' subkey for
+ list=logevents, and a 'logparams' subkey for list=watchlist and
+ list=recentchanges.
+* Log event details are changing formatting:
+ * block events now report flags as an array rather than as a comma-separated
+ list.
+ * patrol events now report the 'auto' flag as a boolean (absent/empty string
+ for BC formats) rather than as an integer.
+ * rights events now report the old and new group lists as arrays rather than
+ as comma-separated lists.
+ * merge events use new-style formatting.
+ * delete/event and delete/revision events use new-style formatting.
+* The root node and various other nodes will now always be an object in formats
+ such as json that distinguish between arrays and objects.
+ * Except for action=opensearch where the spec requires an array.