`Headers.of(String...)` with `headersOf(vararg String)`.

#### Extension Functions

We’ve migrated from static functions to extension functions where we think they fit.

| Java                                | Kotlin                          |
| :---------------------------------- | :------------------------------ |
| Handshake.get(SSLSession)           | SSLSession.handshake()          |

    };

    static final String[] NT_STATUS_MESSAGES = {
        "The operation completed successfully.", "Request is pending", "A notify change request is being completed.",
        "The data was too large to fit into the specified buffer.", "A device attached to the system is not functioning.", "Incorrect function.",
        "The parameter is incorrect.", "Invalid access to memory location.", "The handle is invalid.", "The parameter is incorrect.",

   * @param arrays zero or more {@code char} arrays
   * @return a single array containing all the values from the source arrays, in order
   * @throws IllegalArgumentException if the total number of elements in {@code arrays} does not fit
   *     in an {@code int}
   */
  public static char[] concat(char[]... arrays) {
    long length = 0;
    for (char[] array : arrays) {
      length += array.length;
    }

   * @param arrays zero or more {@code short} arrays
   * @return a single array containing all the values from the source arrays, in order
   * @throws IllegalArgumentException if the total number of elements in {@code arrays} does not fit
   *     in an {@code int}
   */
  public static short[] concat(short[]... arrays) {
    long length = 0;
    for (short[] array : arrays) {
      length += array.length;
    }

   * @param arrays zero or more {@code short} arrays
   * @return a single array containing all the values from the source arrays, in order
   * @throws IllegalArgumentException if the total number of elements in {@code arrays} does not fit
   *     in an {@code int}
   */
  public static short[] concat(short[]... arrays) {
    long length = 0;
    for (short[] array : arrays) {
      length += array.length;
    }

    assertThat(listener.recordedEventTypes().filter { it == "ConnectFailed" }).hasSize(0)
  }

  @Test
  fun callIpv6WhenBothServersAreReachable() {
    // Flip DNS results to prefer IPv6.
    dnsResults =
      listOf(
        localhostIpv6,
        localhostIpv4,
      )
    serverIpv4.enqueue(
      MockResponse(body = "unexpected call to IPv4"),
    )

      <fields>
        <field>
          <name>toolchains</name>
          <version>1.0.0+</version>
          <description>The toolchain instance definition.</description>
          <association xml.itemsStyle="flat">
            <type>ToolchainModel</type>
            <multiplicity>*</multiplicity>
          </association>
        </field>
      </fields>
    </class>
    <class>
      <name>ToolchainModel</name>

xpand):hover .nav-compact.nav-sidebar.nav-child-indent:not(.nav-flat) .nav-treeview{padding-left:1rem;margin-left:-.5rem}.nav-flat{margin:-.25rem -.5rem 0}.nav-flat .nav-item>.nav-link{border-radius:0;margin-bottom:0}.nav-flat .nav-item>.nav-link>.nav-icon{margin-left:.55rem}.nav-flat:not(.nav-child-indent) .nav-treeview .nav-item>.nav-link>.nav-icon{margin-left:.4rem}.nav-flat.nav-child-indent .nav-treeview{padding-left:0}.nav-flat.nav-child-indent .nav-treeview .nav-icon{margin-left:.85rem}.na...

   *       servers {@code alpha}, {@code bravo}, and {@code charlie} and you occasionally need to
   *       take each of the servers offline, {@code consistentHash} will be a poor fit: It provides
   *       no way for you to specify which of the three buckets is disappearing. Thus, if your
   *       buckets change from {@code [alpha, bravo, charlie]} to {@code [bravo, charlie]}, it will

Preferably, these new classes should be 100% managed and have their implementation generated by Gradle at runtime.

It's acceptable for implementation classes to be written to fit into existing code, but new classes must not instantiate managed properties or implement getters manually.

This is preferred:

```groovy
public interface NewThing {
    Property<String> getSomeProperty()
}