* For <a href="https://tools.ietf.org/html/rfc7515">JWS or JWE objects using the Compact
   * Serialization</a>.
   *
   * @since 27.1
   */
  public static final MediaType JOSE = createConstant(APPLICATION_TYPE, "jose");

  /**
   * For <a href="https://tools.ietf.org/html/rfc7515">JWS or JWE objects using the JSON
   * Serialization</a>.
   *
   * @since 27.1
   */

In this case, `item_id` is declared to be an `int`.

/// check

This will give you editor support inside of your function, with error checks, completion, etc.

///

## Data <dfn title="also known as: serialization, parsing, marshalling">conversion</dfn> { #data-conversion }

If you run this example and open your browser at [http://127.0.0.1:8000/items/3](http://127.0.0.1:8000/items/3), you will see a response of:

```JSON

* データの検証:
    * データが無効な場合に自動で明確なエラーを返します。
    * 深い入れ子になった JSON オブジェクトでも検証が可能です。
* 入力データの <dfn title="別名: serialization、parsing、marshalling">変換</dfn>: ネットワークから Python のデータや型へ。以下から読み取ります:
    * JSON。
    * パスパラメータ。
    * クエリパラメータ。
    * Cookie。
    * ヘッダー。
    * フォーム。
    * ファイル。
* 出力データの <dfn title="別名: serialization、parsing、marshalling">変換</dfn>: Python のデータや型からネットワークデータへ（JSON として）変換します:

    )
    return item
```

## Performance

Do not use `ORJSONResponse` or `UJSONResponse`, they are deprecated.

Instead, declare a return type or response model. Pydantic will handle the data serialization on the Rust side.

## Including Routers

When declaring routers, prefer to add router level parameters like prefix, tags, etc. to the router itself, instead of in `include_router()`.

Do this:

      extends AbstractBiMap<K, V> {
    Inverse(Map<K, V> backward, AbstractBiMap<V, K> forward) {
      super(backward, forward);
    }

    /*
     * Serialization stores the forward bimap, the inverse of this inverse.
     * Deserialization calls inverse() on the forward bimap and returns that
     * inverse.
     *
     * If a bimap and its inverse are serialized together, the deserialized

 * {@link ImmutableCollection}.
 *
 * @since 2.0
 */
@GwtCompatible
@SuppressWarnings("serial") // we're overriding default serialization
public abstract class ImmutableSet<E> extends ImmutableCollection<E> implements Set<E> {
  static final int SPLITERATOR_CHARACTERISTICS =
      ImmutableCollection.SPLITERATOR_CHARACTERISTICS | Spliterator.DISTINCT;

  /**

      }
    },
    ;

    abstract Multiset<Integer> get();
  }

  /**
   * Duplication of the old version of ConcurrentHashMultiset (with some unused stuff removed, like
   * serialization code) which used a map with boxed integers for the values.
   */
  private static final class OldConcurrentHashMultiset<E> extends AbstractMultiset<E> {
    /** The number of occurrences of each element. */

   * Instead, copy the list using {@link ImmutableList#copyOf(Collection)} (for example), then
   * serialize the copy. Other methods similar to this do not implement serialization at all for
   * this reason.
   *
   * <p><b>Java 8+ users:</b> many use cases for this method are better addressed by {@link

     * Includes reference counting for multi-threaded access tracking.
     */
    public static class StatsObject extends LinkedHashMap<String, Long> {
        /** Serial version UID for serialization. */
        private static final long serialVersionUID = 1L;

        /** Atomic counter for tracking reference count across multiple threads. */
        protected final AtomicInteger count;

        /**

      }
      forceCopyElements = true;
      return new RegularImmutableSortedMultiset<E>(elementSet, cumulativeCounts, 0, length);
    }
  }

  @J2ktIncompatible // serialization
  private static final class SerializedForm<E> implements Serializable {
    final Comparator<? super E> comparator;
    final E[] elements;
    final int[] counts;

    @SuppressWarnings("unchecked")