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util.pubsub: Fix item retrieval by including the item order as it was before using util.cache (thanks walduhu)

comparison

equal deleted inserted replaced

-:82333dfdfaff
+:29c20eefa306
 	if id then -- Restrict results to a single specific item
 		return true, { id, [id] = self.data[node]:get(id) };
 	else
 		local data = {}
 		for key, value in self.data[node]:items() do
+			data[#data+1] = key;
 			data[key] = value;
 		end
 		return true, data;
 	end
 end