private static void serializeMap(Map<String, Object> childMap, Serializer serializer) {
        for (Map.Entry<String, Object> entry : childMap.entrySet()) {
            String name = entry.getKey();
            Object child = entry.getValue();
            serializeObject(name, child, serializer);
        }
    }
Returns the serialized representation of the given node.
<p>
Declared static, instead of InnerNode member, to avoid a public 0-arg method with a commonly used name.

@param node The inner node
@return a list of strings, containing the serialized representation of this config
config-lib/src/main/java/com/yahoo/config/ConfigInstance.java