try {
            runnable.run();
            throw new AssertionError("Expected " + expectedType.getSimpleName() + " to be thrown");
        } catch (final Throwable t) {
            if (!expectedType.isInstance(t)) {
                throw new AssertionError("Expected " + expectedType.getSimpleName() + " but got " + t.getClass().getSimpleName(), t);
            }
        }
    }

        when {
          isOptional && value == optionalValue -> {
            // Write nothing.
          }

          else -> {
            for ((type, adapter) in choices) {
              if (type.isInstance(value) || (value == null && type == Unit::class)) {
                (adapter as DerAdapter<Any?>).toDer(writer, value)
                return
              }
            }
          }
        }
      }

                    for (Field f : k.getDeclaredFields()) {
                      f.setAccessible(true);
                      Object x = f.get(null);
                      if (k.isInstance(x)) {
                        return k.cast(x);
                      }
                    }
                    return null;
                  });
        } catch (PrivilegedActionException e) {

                        for (Field f : k.getDeclaredFields()) {
                          f.setAccessible(true);
                          Object x = f.get(null);
                          if (k.isInstance(x)) {
                            return k.cast(x);
                          }
                        }
                        throw new NoSuchFieldError("the Unsafe");
                      });

*  `tf.image`
    * Adds JPEG XL support in decode_image.

### Bug Fixes and Other Changes

* `tf.data`
    * Adds `NoneTensorSpec` to the public API so that `None`s in `element_spec`
      can be identified via `isinstance(..., tf.NoneTensorSpec)`.

## Thanks to our Contributors

This release contains contributions from many people at Google, as well as:

   * desiredType}.
   */
  @SuppressWarnings("unchecked") // can cast to <T> because non-Ts are removed
  @GwtIncompatible // Class.isInstance
  public static <T> UnmodifiableIterator<T> filter(Iterator<?> unfiltered, Class<T> desiredType) {
    return (UnmodifiableIterator<T>) filter(unfiltered, instanceOf(desiredType));
  }

  /**

   * desiredType}.
   */
  @SuppressWarnings("unchecked") // can cast to <T> because non-Ts are removed
  @GwtIncompatible // Class.isInstance
  public static <T> UnmodifiableIterator<T> filter(Iterator<?> unfiltered, Class<T> desiredType) {
    return (UnmodifiableIterator<T>) filter(unfiltered, instanceOf(desiredType));
  }

  /**

      throws Throwable {
    for (int i = 0; i < 5; i++) {
      try {
        getDone(transformedFuture);
        fail();
      } catch (ExecutionException expected) {
        if (!expectedExceptionClass.isInstance(expected.getCause())) {
          throw expected.getCause();
        }
      }
    }
  }

  @J2ktIncompatible
  @GwtIncompatible // used only in GwtIncompatible tests

      throws Throwable {
    for (int i = 0; i < 5; i++) {
      try {
        getDone(transformedFuture);
        fail();
      } catch (ExecutionException expected) {
        if (!expectedExceptionClass.isInstance(expected.getCause())) {
          throw expected.getCause();
        }
      }
    }
  }

  @J2ktIncompatible
  @GwtIncompatible // used only in GwtIncompatible tests

    void testGetInstanceWithoutSetInstance() {
        // Test getInstance when no instance has been set
        // Should default to System.err
        LogStream instance = LogStream.getInstance();
        assertNotNull(instance);

        // Getting instance again should return the same instance
        LogStream instance2 = LogStream.getInstance();
        assertSame(instance, instance2);
    }

    @Test