Improved Javadoc for getValue.
@@ -303,7 +303,8 @@ public abstract class ParameterValue implements Serializable {
* Returns the most natural Java object that represents the actual value, like
* boolean, string, etc.
*
- * If there's nothing that really fits the bill, the callee can return {@code this}.
+ * @return if there is no natural value for this parameter type, {@code this} may be used;
+ * {@code null} may be used when the value is normally defined but missing in this case for various reasons
* @since 1.568
*/
@CheckForNull
