Entonces:

```Python
q: Union[str, None] = Query(default=None)
```

...hace que el parámetro sea opcional, con un valor por defecto de `None`, lo mismo que:

```Python

 */
public abstract class JobExecutor {
    /** Listener to handle shutdown events */
    protected ShutdownListener shutdownListener;

    /**
     * Default constructor.
     */
    public JobExecutor() {
        // Default constructor
    }

    /**
     * Executes a script with the specified script type and content.
     *
     * @param scriptType the type of script to execute

 *
 */
public class CreateForm {

    /**
     * Creates a new CreateForm instance.
     */
    public CreateForm() {
        // Default constructor
    }

    /** Dictionary identifier */
    @Required
    public String dictId;

    /** CRUD operation mode (CREATE, EDIT, etc.) */
    @ValidateTypeFailure
    public Integer crudMode;

import jakarta.annotation.Resource;

/**
 * Admin action for Key Match management.
 *
 */
public class AdminKeymatchAction extends FessAdminAction {

    /**
     * Default constructor.
     */
    public AdminKeymatchAction() {
        super();
    }

    /** The role name for key match administration. */
    public static final String ROLE = "admin-keymatch";

					if err := preloadEntryPoint(tx, nestedJoins, &tx.Statement.Schema.Relationships, preloadMap[name], associationsConds); err != nil {
						return err
					}
				default:
					return gorm.ErrInvalidData
				}
			} else {
				tx := db.Table("").Session(&gorm.Session{Context: db.Statement.Context, SkipHooks: db.Statement.SkipHooks})
				tx.Statement.ReflectValue = db.Statement.ReflectValue

${includes} = ?"${maven.user.conf}/maven-system.properties", \
              ?"${maven.project.conf}/maven-system.properties"

#
# Settings
#
# Define the default three levels for settings.
# The '-is' flag will override the 'maven.installation.settings' property.
# The '-ps' flag will override the 'maven.project.settings' property.

     *
     * <p>The default implementation does nothing. Subclasses should override this method
     * if they need to perform cleanup operations.</p>
     *
     * @throws InvokerException if an error occurs while closing the {@link Invoker}
     */
    @Override
    default void close() throws InvokerException {}

                break;
            case UNSPECIFIED:
                result.append("Unspecified error");
                break;
            default:
                result.append("Unknown error code: ").append(errorCode);
            }
            break;
        default:
            result.append("unknown error class: ").append(errorClass);
        }
        return result.toString();
    }

    /**

        @Test
        @DisplayName("Default constructor should create instance with default values")
        void testDefaultConstructor() {
            // When
            DcerpcBind defaultBind = new DcerpcBind();

            // Then
            assertNotNull(defaultBind, "Default constructor should create instance");
            assertEquals(0, defaultBind.getOpnum(), "Default opnum should be 0");
        }

        @Test

var globalSFTPTrustedCAPubkey ssh.PublicKey

// https://cs.opensource.google/go/x/crypto/+/refs/tags/v0.22.0:ssh/common.go;l=46
// preferredKexAlgos specifies the default preference for key-exchange
// algorithms in preference order. The diffie-hellman-group16-sha512 algorithm
// is disabled by default because it is a bit slower than the others.
var preferredKexAlgos = []string{
	kexAlgoCurve25519SHA256, kexAlgoCurve25519SHA256LibSSH,