@SuppressWarnings("unchecked")
  @Override
  @CheckForNull
  public V value(N node) {
    checkNotNull(node);
    Object value = adjacentNodeValues.get(node);
    if (value == PRED) {
      return null;
    }
    if (value instanceof PredAndSucc) {
      return (V) ((PredAndSucc) value).successorValue;
    }
    return (V) value;
  }

  @Override
  public void removePredecessor(N node) {

    <option name="MAIN_CLASS_NAME" value="" />
    <option name="METHOD_NAME" value="" />
    <option name="TEST_OBJECT" value="tags" />
    <option name="VM_PARAMETERS" value="-ea -Djunit.jupiter.extensions.autodetection.enabled=true" />
    <option name="PARAMETERS" value="" />
    <option name="TEST_SEARCH_SCOPE">
      <value defaultName="wholeProject" />
    </option>
    <tag value="!Slow &amp; !Slowish &amp; !Remote &amp; !Android" />

  }

  // A simple type whose .toString() will return the same value each time, but without maintaining
  // a strong reference to that value.
  static class Key {
    private final int value;
    private WeakReference<String> toString;

    Key(int value) {
      this.value = value;
    }

    @Override
    public synchronized String toString() {
      String s;

    private String name;

    private String value;

    public RequestHeader(final String name, final String value) {
        this.name = name;
        this.value = value;
    }

    public String getName() {
        return name;
    }

    public void setName(final String name) {
        this.name = name;
    }

    public String getValue() {
        return value;
    }

    <snapshotVersions>
      <snapshotVersion>
        <extension>jar</extension>
        <value>12.2.0-20180814.210714-10</value>
        <updated>20180814210714</updated>
      </snapshotVersion>
      <snapshotVersion>
        <extension>pom</extension>
        <value>12.2.0-20180814.210714-10</value>
        <updated>20180814210714</updated>
      </snapshotVersion>
      <snapshotVersion>

    assertNull(
        "putIfAbsent(notPresent, value) should return null", getMap().putIfAbsent(k3(), v3()));
    expectAdded(e3());
  }

  @MapFeature.Require(SUPPORTS_PUT)
  @CollectionSize.Require(absent = ZERO)
  public void testPutIfAbsent_supportedPresent() {
    assertEquals(
        "putIfAbsent(present, value) should return existing value",
        v0(),
        getMap().putIfAbsent(k0(), v3()));

  var bodyLimit: Long by delegate::bodyLimit

  var serverSocketFactory: ServerSocketFactory? by delegate::serverSocketFactory

  var dispatcher: Dispatcher = QueueDispatcher()
    set(value) {
      field = value
      delegate.dispatcher = value.wrap()
    }

  val port: Int
    get() {
      before() // This implicitly starts the delegate.
      return delegate.port
    }

  val hostName: String
    get() {

     */
    protected JsonUtil() {
    }

    /**
     * Escapes a value as Json string.
     *
     * @param value input
     * @return escaped string.
     */
    public static String escape(final String value) {
        if (value == null) {
            return null;
        }

        char c;
        final int len = value.length();
        final StringBuilder buf = new StringBuilder(len * 2);

                          "client_sampling": {
                            "value": 100
                          },
                          "random_sampling": {
                            "value": 1
                          },
                          "overall_sampling": {
                            "value": 100
                          },
                          "custom_tags": [

    }

  fun addHeader(
    name: String,
    value: Any,
  ) = apply {
    headersBuilder.add(name, value.toString())
  }

  fun addHeaderLenient(
    name: String,
    value: Any,
  ) = apply {
    addHeaderLenient(headersBuilder, name, value.toString())
  }

  fun setHeader(
    name: String,
    value: Any,
  ) = apply {
    removeHeader(name)