var (
	ErrSyntax        = DecoderError{msg: "invalid character"}
	ErrUnexpectedEOF = DecoderError{msg: "unexpected end of JSON input"}
	ErrMaxDepth      = DecoderError{msg: "maximum recursion depth exceeded"}
)

type errPos [2]int // line number, byte offset where error occurred

// DecoderError contains a detailed decoding error.
type DecoderError struct {
	msg       string // description of error
	context   string // additional error context

¿Recuerdas que te dije antes que `Annotated` puede usarse para agregar metadatos a tus parámetros en la [Introducción a Tipos de Python](../python-types.md#type-hints-with-metadata-annotations){.internal-link target=_blank}?

Ahora es el momento de usarlo con FastAPI. 🚀

Teníamos esta anotación de tipo:

//// tab | Python 3.10+

```Python
q: str | None = None
```

* `write(data)`: Записать данные `data` (`str` или `bytes`) в файл.
* `read(size)`: Прочитать количество `size` (`int`) байт/символов из файла.
* `seek(offset)`: Перейти к байту на позиции `offset` (`int`) в файле.
    * Например, `await myfile.seek(0)` перейдет к началу файла.

    //
    // 6) Get reactor projects looking for general POM errors
    //
    // 7) Create ProjectDependencyGraph using trimming which takes into account --projects and reactor mode.
    // This ensures that the projects passed into the ReactorReader are only those specified.
    //
    // 8) Create ReactorReader with the getProjectMap( projects ). NOTE that getProjectMap(projects) is the code that

`HeroPublic`은 `HeroBase`와 동일한 필드를 가지며, `secret_name`은 포함하지 않습니다.

마침내 우리의 heroes의 정체가 보호됩니다! 🥷

또한 `id: int`를 다시 선언합니다. 이를 통해, API 클라이언트와 **계약**을 맺어 `id`가 항상 존재하며 항상 `int` 타입이라는 것을 보장합니다(`None`이 될 수 없습니다).

/// tip | 팁

반환 모델이 값이 항상 존재하고 항상 `int`(`None`이 아님)를 보장하는 것은 API 클라이언트에게 매우 유용합니다. 이를 통해 API와 통신하는 개발자가 훨씬 더 간단한 코드를 작성할 수 있습니다.

import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;

/**
 * The {@code Immutable} annotation indicates that the object is immutable, i.e.
 * none of its field can be changed.  This also ensures that the type is
 * {@link ThreadSafe}.
 *
 * @see ThreadSafe
 * @since 4.0.0
 */
@Experimental
@Documented
@Retention(RetentionPolicy.CLASS)
@ThreadSafe

KIND, either express or implied.  See the License for the
specific language governing permissions and limitations
under the License.
-->

<project>
  <modelVersion>4.0.0</modelVersion>

  <groupId>org.apache.maven.its.mng3906</groupId>
  <artifactId>b</artifactId>
  <version>0.1</version>
  <packaging>jar</packaging>

  <distributionManagement>
    <repository>
      <id>maven-core-it</id>
      <url>file:///${basedir}/repo</url>

KIND, either express or implied.  See the License for the
specific language governing permissions and limitations
under the License.
-->

<project>
  <modelVersion>4.0.0</modelVersion>

  <groupId>org.apache.maven.its.mng3906</groupId>
  <artifactId>d</artifactId>
  <version>0.1</version>
  <packaging>jar</packaging>

  <distributionManagement>
    <repository>
      <id>maven-core-it</id>
      <url>file:///${basedir}/repo</url>

//
// You should have received a copy of the GNU Affero General Public License
// along with this program.  If not, see <http://www.gnu.org/licenses/>.

package cmd

// SetupType - enum for setup type.
type SetupType int

const (
	// UnknownSetupType - starts with unknown setup type.
	UnknownSetupType SetupType = iota

	// FSSetupType - FS setup type enum.
	FSSetupType

	// ErasureSDSetupType - Erasure single drive setup enum.

    private static class SimpleProblemCollector implements SettingsProblemCollector {

        List<String> messages = new ArrayList<>();

        @Override
        public void add(Severity severity, String message, int line, int column, Exception cause) {
            messages.add(message);
        }
    }