*   return xBits == yBits;
 * }
 * }</pre>
 *
 * <p>It is possible to write a more scalable updater, at the cost of giving up strict atomicity.
 * See for example <a
 * href="http://gee.cs.oswego.edu/dl/jsr166/dist/docs/java.base/java/util/concurrent/atomic/DoubleAdder.html">
 * DoubleAdder</a>.
 *
 * @author Doug Lea
 * @author Martin Buchholz
 * @since 11.0
 */
@ElementTypesAreNonnullByDefault