--- old/src/share/classes/java/util/function/DoubleUnaryOperator.java	2012-11-26 17:53:02.595300040 -0800
+++ new/src/share/classes/java/util/function/DoubleUnaryOperator.java	2012-11-26 17:53:02.391300029 -0800
@@ -30,7 +30,10 @@
  *
  * @since 1.8
  */
-public interface DoubleUnaryOperator {
+public interface DoubleUnaryOperator extends UnaryOperator<Double> {
+
+    @Override
+    public default Double operate(Double operand) { return operateAsDouble((double) operand); }
 
     /**
      * Returns the {@code double} result of the operation upon the