* [addSubjectAlternativeName]. If unset a random string will be used.
     *
     * [rfc_2818]: https://tools.ietf.org/html/rfc2818
     */
    fun commonName(cn: String) =
      apply {
        this.commonName = cn
      }

    /** Sets the certificate's organizational unit (OU). If unset this field will be omitted. */
    fun organizationalUnit(ou: String) =
      apply {

// compares the MaximumVolumeSize against the requested size of pending volumes
// to filter out unsuitable nodes. If MaximumVolumeSize is unset, it falls back
// to a comparison against the less precise Capacity. If that is also unset,
// the scheduler assumes that capacity is insufficient and tries some other
// node.
message CSIStorageCapacity {

      throw new AssertionError();
    }
  }

  /**
   * A singleton {@link WeakValueReference} used to denote an unset value in an entry with weak
   * values.
   */
  static final WeakValueReference<Object, Object, DummyInternalEntry> UNSET_WEAK_VALUE_REFERENCE =
      new WeakValueReference<Object, Object, DummyInternalEntry>() {
        @CheckForNull
        @Override

      };

  /** Singleton placeholder that indicates a value is being loaded. */
  @SuppressWarnings("unchecked") // impl never uses a parameter or returns any non-null value
  static <K, V> ValueReference<K, V> unset() {
    return (ValueReference<K, V>) UNSET;
  }

  private enum NullEntry implements ReferenceEntry<Object, Object> {
    INSTANCE;

    @CheckForNull
    @Override

### Use the `response_model_exclude_unset` parameter

You can set the *path operation decorator* parameter `response_model_exclude_unset=True`:

=== "Python 3.10+"

    ```Python hl_lines="22"
    {!> ../../../docs_src/response_model/tutorial004_py310.py!}
    ```

=== "Python 3.9+"

  // Note that this is intersected with the policy's matchConstraints, so only requests that are matched by the policy can be selected by this.
  // If this is unset, all resources matched by the policy are validated by this binding
  // When resourceRules is unset, it does not constrain resource matching. If a resource is matched by the other fields of this object, it will be validated.

      };

  /** Singleton placeholder that indicates a value is being loaded. */
  @SuppressWarnings("unchecked") // impl never uses a parameter or returns any non-null value
  static <K, V> ValueReference<K, V> unset() {
    return (ValueReference<K, V>) UNSET;
  }

  private enum NullEntry implements ReferenceEntry<Object, Object> {
    INSTANCE;

    @CheckForNull
    @Override

    y: str = "y"
    z: str = "z"


@app.get("/", response_model=Model, response_model_exclude_unset=True)
def get_root() -> ModelSubclass:
    return ModelSubclass(sub={}, y=1, z=0)


@app.get(
    "/exclude_unset", response_model=ModelDefaults, response_model_exclude_unset=True
)
def get_exclude_unset() -> ModelDefaults:
    return ModelDefaults(x=None, y="y")


@app.get(
    "/exclude_defaults",

### Den `response_model_exclude_unset`-Parameter verwenden

Sie können den *Pfadoperation-Dekorator*-Parameter `response_model_exclude_unset=True` setzen:

=== "Python 3.10+"

    ```Python hl_lines="22"
    {!> ../../../docs_src/response_model/tutorial004_py310.py!}
    ```

    steps:
      - name: git clone
        uses: actions/checkout@v4
      - id: setup-matrix
        run: echo "matrix=$(jq -c -f .github/workflows/extract-unit-test-split.jq .teamcity/subprojects.json)" >> $GITHUB_OUTPUT
      - name: setup java
        uses: actions/setup-java@v4
        with:
          distribution: temurin
          java-version: 11
      - id: determine-sys-prop-args
        uses: actions/github-script@v7
        with: