///

**FastAPI** will do the automatic conversion from the request, so that the parameter `item` receives its specific content and the same for `user`.

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 }

  private static final Ordering<List<Class<?>>> ORDERING_BY_CONSTRUCTOR_PARAMETER_LIST =
      Ordering.natural()
          .onResultOf((List<Class<?>> params) -> params.contains(String.class))
          .compound(
              Ordering.natural()
                  .onResultOf((List<Class<?>> params) -> params.contains(Throwable.class)))
          .reverse();

            this.maxVersion = this.minVersion;
        }
    }

    /**
     * Initializes the disallowed compound operations based on the provided property string.
     *
     * @param prop comma-separated list of operations to disallow in compound requests
     */
    protected void initDisallowCompound(final String prop) {
        if (prop == null) {
            return;
        }

            verify(mockConfig, times(2)).isAllowCompound("TestServerMessageBlock2Request");
        }

        @Test
        @DisplayName("allowChain should return false when config disallows compound")
        void testAllowChainDisallowed() {
            TestServerMessageBlock2Request nextRequest = new TestServerMessageBlock2Request(mockConfig);
            when(mockConfig.isAllowCompound(anyString())).thenReturn(false);

    assertThat("hello".map()).isEqualTo("hello")
    assertThat("hello-world".map()).isEqualTo("hello-world")
    assertThat("HELLO".map()).isEqualTo("hello")
    assertThat("Hello".map()).isEqualTo("hello")

    // These compound characters map their its components.
    assertThat("¼".map()).isEqualTo("1⁄4")
    assertThat("™".map()).isEqualTo("tm")
  }

  /** Confirm the compact table satisfies is documented invariants. */

#       requires all of these POSIX shell features:
#         * functions;
#         * expansions «$var», «${var}», «${var:-default}», «${var+SET}»,
#           «${var#prefix}», «${var%suffix}», and «$( cmd )»;
#         * compound commands having a testable exit status, especially «case»;
#         * various built-in commands including «command», «set», and «ulimit».
#
#   Important for patching:
#

    // to fill dummy parameter values for them. Ties are broken by name then by the string form of
    // the parameter list.
    return BY_NUMBER_OF_PARAMETERS
        .compound(BY_METHOD_NAME)
        .compound(BY_PARAMETERS)
        .immutableSortedCopy(factories);
  }

  private List<Object> getDummyArguments(Invokable<?, ?> invokable)
      throws ParameterNotInstantiableException {

            if (Thread.currentThread() == this.thread) {
                // we are in the transport thread, ie. on idle disconnecting
                // this is synchronous operation
                // This does not handle compound requests
                synchronized (this.inLock) {
                    final Long peekKey = peekKey();
                    if (peekKey == firstKey) {
                        doRecv(response);

                }

                rl = nextCommand != 0 ? nextCommand : size;

                if (log.isDebugEnabled()) {
                    log.debug(String.format("Compound next command %d read size %d remain %d", nextCommand, rl, size));
                }

                cur.setReadSize(rl);

   * ```
   */
  var tagClass: Int,
  /** Identifies which member in the ASN.1 schema the field holds. */
  var tag: Long,
  /**
   * If the constructed bit is set it indicates that the value is composed of other values that have
   * their own headers.
   *
   * This value is encoded in bit 6 of the first byte of each value.
   *
   * ```
   * 0bxx0xxxxx Primitive
   * 0bxx1xxxxx Constructed
   * ```
   */