*
   * <ul>
   *   <li>{@code equivalent(x, x)} is true (<i>reflexive</i> property)
   *   <li>{@code equivalent(x, y)} and {@code equivalent(y, x)} each return the same result
   *       (<i>symmetric</i> property)
   *   <li>If {@code equivalent(x, y)} and {@code equivalent(y, z)} are both true, then {@code
   *       equivalent(x, z)} is also true (<i>transitive</i> property)
   * </ul>
   *

 * **Route**: address, proxy, socketAddress
 * **TlsVersion**: javaName

#### Renamed Functions

* **Headers.of()**: for symmetry with `listOf()`, `setOf()`, etc., we’ve replaced
  `Headers.of(String...)` with `headersOf(vararg String)`.

#### Extension Functions

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

 *
 *  * **A validity interval.** A certificate should not be used before its validity interval starts
 *    or after it ends.
 *
 *  * **A public key.** This cryptographic key is used for asymmetric encryption digital signatures.
 *    Note that the private key is not a part of the certificate!
 *
 *  * **A signature issued by another certificate's private key.** This mechanism allows a trusted

        assertTrue(item1.equals(item4));

        // Null object
        assertFalse(item1.equals(null));

        // Different class
        assertFalse(item1.equals("word"));

        // Symmetry
        assertTrue(item1.equals(item2));
        assertTrue(item2.equals(item1));
    }

    public void test_equals_withNullInput() {
        // Test equals with null input

        CharMappingItem item4 = new CharMappingItem(4L, inputs1, "different");

        // Test reflexivity
        assertTrue(item1.equals(item1));

        // Test symmetry and arrays with different order
        assertTrue(item1.equals(item2));
        assertTrue(item2.equals(item1));

        // Test with different inputs
        assertFalse(item1.equals(item3));

   * {@link TypeVariableImpl#equals(Object)} is changed to no longer be equal to custom TypeVariable
   * implementations. As a result, we need to make sure our TypeVariable implementation respects
   * symmetry. Moreover, we don't want to reconstruct a native type variable {@code <A>} using our
   * implementation unless some of its bounds have changed in resolution. This avoids creating

      tester.testEquals();
    } catch (AssertionFailedError e) {
      assertErrorMessage(e, "bar [group 1, item 2] must be Object#equals to foo [group 1, item 1]");
      return;
    }
    fail("should failed because symmetry is broken");
  }

  public void testTransitivityBrokenInEqualityGroup() {
    EqualsTester tester =
        new EqualsTester()
            .addEqualityGroup(

  }

  /**
   * This accepts a [BufferedSource] instead of using [Socket.source], just in case we've already
   * received data from the peer. This accepts a [BufferedSink] for symmetry with the source.
   */
  fun initReaderAndWriter(
    name: String,
    socket: BufferedSocket,
    client: Boolean,
  ) {
    val extensions = this.extensions!!
    synchronized(this) {

   * {@link TypeVariableImpl#equals(Object)} is changed to no longer be equal to custom TypeVariable
   * implementations. As a result, we need to make sure our TypeVariable implementation respects
   * symmetry. Moreover, we don't want to reconstruct a native type variable {@code <A>} using our
   * implementation unless some of its bounds have changed in resolution. This avoids creating

    }

    @Override
    public boolean equals(@Nullable Object obj) {
      // In general getClass().isInstance() is bad for equals.
      // But here we fully control the subclasses to ensure symmetry.
      if (getClass().isInstance(obj)) {
        Wrapper that = (Wrapper) obj;
        return wrapped.equals(that.wrapped);
      }
      return false;
    }

    @Override