return Iterators.peekingIterator(iterator);
    }

    @Override
    protected void verify(List<T> elements) {
      // verify same objects were removed from reference and target
      assertEquals(elements, targetList);
    }
  }

  private <T extends @Nullable Object> void actsLikeIteratorHelper(List<T> list) {
    // Check with modifiable copies of the list
    new PeekingIteratorTester<T>(list).test();

        Method userMethod = processHandleInfoClass.getMethod("user");
        Method orElseMethod = optionalClass.getMethod("orElse", Object.class);

        Object current = currentMethod.invoke(null);
        Object info = infoMethod.invoke(current);
        Object user = userMethod.invoke(info);
        return (String) requireNonNull(orElseMethod.invoke(user, fromSystemProperty));

- The CSINodeInfo feature gate is deprecated and will be removed in a future release. The storage.k8s.io/v1beta1 CSINode object is deprecated and will be removed in a future release. ([#83474](https://g...

   * {@link #valueField} of {@code future}.
   */
  static boolean casValue(AbstractFutureState<?> future, @Nullable Object expect, Object update) {
    return ATOMIC_HELPER.casValue(future, expect, update);
  }

  /** Returns the value of the future, using a volatile read. */
  final @Nullable Object value() {
    return valueField;
  }

  /** Returns the head of the listener stack, using a volatile read. */

title="also called marshalling, conversion">serialization</abbr>" which is taking data from the code (Python) and converting it into something that can be sent through the network. For example, converting an object containing data from a database into a JSON object. Converting `datetime` objects into strings, etc.

Another big feature needed by APIs is data validation, making sure that the data is valid, given certain parameters. For example, that some field is an `int`, and not some random...

   * constructed.
   */
  @Override
  public boolean containsRow(@Nullable Object rowKey) {
    return rowKeyToIndex.containsKey(rowKey);
  }

  @Override
  public boolean containsValue(@Nullable Object value) {
    for (@Nullable V[] row : array) {
      for (V element : row) {
        if (Objects.equals(value, element)) {
          return true;
        }
      }
    }
    return false;

  private static <T> T newProxy(Class<T> interfaceType, InvocationHandler handler) {
    Object object =
        Proxy.newProxyInstance(
            interfaceType.getClassLoader(), new Class<?>[] {interfaceType}, handler);
    return interfaceType.cast(object);
  }

  @ParametricNullness
  private <T extends @Nullable Object> T callWithTimeout(

import org.apache.maven.api.ProtoSession;
import org.apache.maven.api.annotations.Experimental;
import org.apache.maven.api.annotations.Nonnull;
import org.apache.maven.api.annotations.Nullable;

import static java.util.Objects.requireNonNull;

/**
 * Collects problems that were encountered during project building.
 *
 * @param <P> The type of the problem.
 * @since 4.0.0
 */
@Experimental

#### Other API changes:

You can return a `dict`, `list`, singular values as `str`, `int`, etc.

You can also return Pydantic models (you'll see more about that later).

There are many other objects and models that will be automatically converted to JSON (including ORMs, etc). Try using your favorite ones, it's highly probable that they are already supported.

## Recap { #recap }

* Import `FastAPI`.