for prod and one for tests. However, unlike our other packages, as of this
    writing it has test supersource but no prod supersource.

    GWT happens to use the prod .gwt.xml, so it looks for no supersource for
    tests, either. This causes it to fail to find AtomicLongMapTest.

    Our workaround is to tell GWT that util.concurrent and all other packages

/// tip | Consejo

Tener el modelo de retorno asegurando que un valor siempre esté disponible y siempre sea `int` (no `None`) es muy útil para los clientes de la API, pueden escribir código mucho más simple teniendo esta certeza.

## URLs da Documentação

Você pode configurar as duas interfaces de documentação incluídas:

* **Swagger UI**: acessível em `/docs`.
    * Você pode definir sua URL com o parâmetro `docs_url`.
    * Você pode desativá-la definindo `docs_url=None`.
* **ReDoc**: acessível em `/redoc`.

쿼리 매개변수를 선언할 때와 같이, 모델 어트리뷰트가 기본 값을 가지고 있어도 이는 필수가 아닙니다. 그외에는 필수입니다. 그저 `None`을 사용하여 선택적으로 만들 수 있습니다.

예를 들면, 위의 이 모델은 JSON "`object`" (혹은 파이썬 `dict`)을 다음과 같이 선언합니다:

```JSON
{
    "name": "Foo",
    "description": "선택적인 설명란",
    "price": 45.2,
    "tax": 3.5
}
```

...`description`과 `tax`는 (기본 값이 `None`으로 되어 있어) 선택적이기 때문에, 이 JSON "`object`"는 다음과 같은 상황에서도 유효합니다:

```JSON
{
    "name": "Foo",

     * @return the classifier or an empty string if none, never {@code null}
     * @see ArtifactCoordinates#getClassifier()
     */
    @Nonnull
    String getClassifier();

    /**
     * Returns the file extension of the artifact.
     * The dot separator is not included in the returned string.
     *
     * @return the file extension or an empty string if none, never {@code null}

    }

    @Test
    public void testHandleType() {
        assertEquals(0, HandleType.NONE.getValue());
        assertEquals(1, HandleType.DURABLE_V1.getValue());
        assertEquals(2, HandleType.DURABLE_V2.getValue());
        assertEquals(3, HandleType.PERSISTENT.getValue());

        assertEquals(HandleType.NONE, HandleType.fromValue(0));
        assertEquals(HandleType.DURABLE_V1, HandleType.fromValue(1));

Par exemple, le modèle ci-dessus déclare un "objet" JSON (ou `dict` Python) tel que :

```JSON
{
    "name": "Foo",
    "description": "An optional description",
    "price": 45.2,
    "tax": 3.5
}
```

...`description` et `tax` étant des attributs optionnels (avec `None` comme valeur par défaut), cet "objet" JSON serait aussi valide :

    }

    /**
     * The {@code javax.tool} enumeration value corresponding to this {@code JavaPathType}, or {@code null} if none.
     *
     * @see #location()
     */
    private final JavaFileManager.Location location;

    /**
     * The tools option for this path, or {@code null} if none.
     *
     * @see #option()
     */
    private final String option;

    /**

## URLs de Docs

Puedes configurar las dos interfaces de usuario de documentación incluidas:

* **Swagger UI**: servida en `/docs`.
    * Puedes establecer su URL con el parámetro `docs_url`.
    * Puedes deshabilitarla estableciendo `docs_url=None`.
* **ReDoc**: servida en `/redoc`.

     * Sie können deren URL mit dem Parameter `docs_url` festlegen.
     * Sie können sie deaktivieren, indem Sie `docs_url=None` festlegen.
* **ReDoc**: bereitgestellt unter `/redoc`.
     * Sie können deren URL mit dem Parameter `redoc_url` festlegen.
     * Sie können sie deaktivieren, indem Sie `redoc_url=None` festlegen.