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

- データの検証:
  - データが無効な場合に自動でエラーをクリアします。
  - 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<abbr title="also known as: serialization, parsing, marshalling">変換</abbr>: ネットワークから Python のデータや型に変換してから読み取ります:
  - JSON.
  - パスパラメータ
  - クエリパラメータ
  - クッキー
  - ヘッダー
  - フォーム
  - ファイル
- 出力データの<abbr title="also known as: serialization, parsing, marshalling">変換</abbr>: Python のデータや型からネットワークデータへ変換します (JSON として):

/**
 * GWT emulated version of {@link com.google.common.collect.ImmutableList}. TODO(cpovirk): more doc
 *
 * @author Hayward Chan
 */
@SuppressWarnings("serial") // we're overriding default serialization
public abstract class ImmutableList<E> extends ImmutableCollection<E>
    implements List<E>, RandomAccess {

  ImmutableList() {}

  public static <E> Collector<E, ?, ImmutableList<E>> toImmutableList() {

   * obtained by calling {@code snapshot()} on the same {@link StatsAccumulator} without adding any
   * values in between the two calls, or if one is obtained from the other after round-tripping
   * through java serialization. However, floating point rounding errors mean that it may be false
   * for some instances where the statistics are mathematically equal, including instances

* <abbr title="also known as: serialization, parsing, marshalling">Ìyípadà</abbr> tí input àkójọf'áyẹ̀wò: tí ó wà láti nẹtiwọọki si àkójọf'áyẹ̀wò àti irúfẹ́ àmì ìtọ́kasí Python. Ó ń ka láti:
    * JSON.
    * èròjà ọ̀nà tí ò gbé gbà.
    * èròjà ìbéèrè.
    * Àwọn Kúkì
    * Àwọn Àkọlé
    * Àwọn Fọọmu
    * Àwọn Fáìlì

* پشتیبانی ویرایشگر متنی شامل:
    * تکمیل کد.
    * بررسی انواع داده.
* اعتبارسنجی داده:
    * خطاهای خودکار و مشخص در هنگام نامعتبر بودن داده.
    * اعتبارسنجی، حتی برای اشیاء JSON تو در تو.
* <abbr title="serialization, parsing, marshalling">تبدیل</abbr> داده ورودی: که از شبکه رسیده به انواع و داد‌ه‌ پایتونی. این داده‌ شامل:
    * JSON.
    * <abbr title="Path parameters">پارامترهای مسیر</abbr>.

    * une validation même pour les objets <abbr title="JavaScript Object Notation">JSON</abbr> profondément imbriqués.
* <abbr title="aussi connu sous le nom de : serialization, parsing, marshalling">Une conversion</abbr> des données d'entrée : venant du réseau et allant vers les données et types de Python, permettant de lire :
    * le <abbr title="JavaScript Object Notation">JSON</abbr>.

   * 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
   */

     * Builder}.
     */
    @Override
    public ImmutableSortedMultiset<E> build() {
      return copyOfSorted((SortedMultiset<E>) contents);
    }
  }

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

    @SuppressWarnings("unchecked")

* <abbr title="also known as: serialization, parsing, marshalling">Conversion</abbr> of input data: coming from the network to Python data and types. Reading from:
    * JSON.
    * Path parameters.
    * Query parameters.
    * Cookies.
    * Headers.
    * Forms.
    * Files.