It will perform the validation of the compound data, and will document it like that for the OpenAPI schema and automatic docs.

## Singular values in body { #singular-values-in-body }

The same way there is a `Query` and `Path` to define extra data for query and path parameters, **FastAPI** provides an equivalent `Body`.

     * be created automatically.
     *
     * @param output The file to serialize the settings to, must not be {@code null}.
     * @param options The options to use for serialization, may be {@code null} to use the default values.
     * @param settings The settings to serialize, must not be {@code null}.
     * @throws IOException If the settings could not be serialized.
     */

///

## Duplicate headers { #duplicate-headers }

It is possible to receive duplicate headers. That means, the same header with multiple values.

You can define those cases using a list in the type declaration.

You will receive all the values from the duplicate header as a Python `list`.

For example, to declare a header of `X-Token` that can appear more than once, you can write:

        setErrorCount_PercentileRanks(values, null);
    }

    public void setErrorCount_PercentileRanks(double[] values, ConditionOptionCall<PercentileRanksAggregationBuilder> opLambda) {
        setErrorCount_PercentileRanks("errorCount", values, opLambda);
    }

    public void setErrorCount_PercentileRanks(String name, double[] values,

		Used:   uint64(lpTotalNumberOfBytes) - uint64(lpTotalNumberOfFreeBytes),
		FSType: getFSType(path),
	}

	// Return values of GetDiskFreeSpace()
	lpSectorsPerCluster := uint32(0)
	lpBytesPerSector := uint32(0)
	lpNumberOfFreeClusters := uint32(0)
	lpTotalNumberOfClusters := uint32(0)

	// Extract values safely
	// BOOL WINAPI GetDiskFreeSpace(
	//   _In_  LPCTSTR lpRootPathName,
	//   _Out_ LPDWORD lpSectorsPerCluster,

  public List<V> removeAll(@Nullable Object key) {
    return (List<V>) super.removeAll(key);
  }

  @Override
  public List<V> replaceValues(@ParametricNullness K key, Iterable<? extends V> values) {
    return (List<V>) super.replaceValues(key, values);
  }

  }

  @Override
  final Spliterator<Cell<R, C, V>> cellSpliterator() {
    throw new AssertionError("should never be called");
  }

  @Override
  public ImmutableCollection<V> values() {
    return (ImmutableCollection<V>) super.values();
  }

  @Override
  abstract ImmutableCollection<V> createValues();

  @Override
  final Iterator<V> valuesIterator() {

     * Default constructor for RelatedQueryPager.
     * Initializes a new instance with default values for pagination
     * and related query fields.
     */
    public RelatedQueryPager() {
        // Default constructor - fields will be initialized to default values
    }

    /**
     * Clears all pager data and resets to default values.
     * Resets pagination state and clears all related query fields.
     */

     * can narrow the possible floor(log10(x)) values to two. For example, if floor(log2(x)) is 6,
     * then 64 <= x < 128, so floor(log10(x)) is either 1 or 2.
     */
    int y = maxLog10ForLeadingZeros[Long.numberOfLeadingZeros(x)];
    /*
     * y is the higher of the two possible values of floor(log10(x)). If x < 10^y, then we want the
     * lower of the two possible values, or y - 1, otherwise, we want y.
     */

   *
   * <p>The serialized output consists of the number of distinct keys, and then for each distinct
   * key: the key, the number of values for that key, and the key's values.
   */
  static <K extends @Nullable Object, V extends @Nullable Object> void writeMultimap(
      Multimap<K, V> multimap, ObjectOutputStream stream) throws IOException {