val address = canonicalizeInetAddress(inetAddressByteArray)
    if (address.size == 16) return inet6AddressToAscii(address)
    if (address.size == 4) return inet4AddressToAscii(address) // An IPv4-mapped IPv6 address.
    throw AssertionError("Invalid IPv6 address: '$host'")
  }

  val result = idnToAscii(host) ?: return null
  if (result.isEmpty()) return null
  if (result.containsInvalidHostnameAsciiCodes()) return null

```

### Exception Handling
```java
import org.codelibs.core.exception.*;

// Runtime exception wrappers eliminate try-catch boilerplate
try {
    // Code that might throw checked exceptions
    return ClassUtil.newInstance(className); // Wraps checked exceptions automatically
} catch (ClassNotFoundRuntimeException e) {
    // Handle the wrapped exception

            bb.putShort((short) 0); // tflags high bytes

            // Invalid referral version
            bb.putShort((short) 99); // unsupported version

            // Should throw exception for unsupported version
            assertThrows(Exception.class, () -> {
                buffer.decode(testBuffer, 0, testBuffer.length);
            });
        }
    }

    @Nested

        List<RelatedContent> testData = new ArrayList<>();
        testData.add(createRelatedContent("regex:", "Invalid Regex", ""));
        mockBhv.setTestData(testData);

        // Should not throw exception, just log warning
        relatedContentHelper.load();

        String[] results = relatedContentHelper.getRelatedContents("anything");
        assertEquals(0, results.length);
    }

        callback.store(params, data);
        callback.store(params, data);

        assertEquals(3L, callback.getDocumentSize());
        assertEquals(300L, callback.getExecuteTime());

        // Test commit (should not throw exception)
        callback.commit();
    }

    public void test_multiple_implementations() {
        // Test with different implementations to ensure interface contract

                badWordService.importCsv(reader);
                suggestHelper.storeAllBadWords(false);
            } catch (final Exception e) {
                throw new FessSystemException("Failed to import data.", e);
            }
        });
        return asJson(new ApiResult.ApiResponse().status(ApiResult.Status.OK).result());
    }

    /**

  public abstract ImmutableBiMap<V, K> inverse();

  @Override
  public ImmutableSet<V> values() {
    return inverse().keySet();
  }

  public final @Nullable V forcePut(K key, V value) {
    throw new UnsupportedOperationException();
  }

            // Check if transport creation failed
            if (newTransport == null) {
                throw new IOException("Failed to create new transport");
            }

            // Reconnect
            channel.setState(ChannelState.CONNECTING);

    checkNotNull(keyFunction);
    checkNotNull(valueFunction);
    return Collector.of(
        () ->
            new EnumMapAccumulator<K, V>(
                (v1, v2) -> {
                  throw new IllegalArgumentException("Multiple values for key: " + v1 + ", " + v2);
                }),
        (accum, t) -> {
          /*

      case UNORDERED:
        orderedNodeConnections = null;
        break;
      case STABLE:
        orderedNodeConnections = new ArrayList<>();
        break;
      default:
        throw new AssertionError(incidentEdgeOrder.type());
    }

    return new DirectedGraphConnections<>(
        /* adjacentNodeValues= */ new HashMap<N, Object>(initialCapacity, INNER_LOAD_FACTOR),
        orderedNodeConnections,