var supportedKexAlgos = []string{
	kexAlgoCurve25519SHA256, kexAlgoCurve25519SHA256LibSSH,
	// P384 and P521 are not constant-time yet, but since we don't
	// reuse ephemeral keys, using them for ECDH should be OK.
	kexAlgoECDH256, kexAlgoECDH384, kexAlgoECDH521,
	kexAlgoDH14SHA256, kexAlgoDH16SHA512, kexAlgoDH14SHA1,
	kexAlgoDH1SHA1,
}

        cells.add(immutableCell);
      } else {
        put(cell.getRowKey(), cell.getColumnKey(), cell.getValue());
      }
      return this;
    }

    /**
     * Associates all of the given table's keys and values in the built table. Duplicate row key
     * column key pairs are not allowed, and will cause {@link #build} to fail.
     *
     * @throws NullPointerException if any key or value in {@code table} is null
     */

				"application/mbms-user-service-description+xml",
				"application/mbox",
				"application/media_control+xml",
				"application/mediaservercontrol+xml",
				"application/mikey",
				"application/moss-keys",
				"application/moss-signature",
				"application/mosskey-data",
				"application/mosskey-request",
				"application/mp4",
				"application/mpeg4-generic",
				"application/mpeg4-iod",

            .createTestSuite());
    suite.addTest(
        ConcurrentMapTestSuiteBuilder.using(
                new TestStringCacheGenerator(createCacheBuilder().weakKeys()))
            .named("LocalCache with weakKeys") // keys are string literals and won't be GC'd
            .withFeatures(
                CollectionSize.ANY,
                MapFeature.GENERAL_PURPOSE,
                CollectionFeature.SUPPORTS_ITERATOR_REMOVE)

    
    // Getters and increment methods
}
```

## 12. Future Enhancements

1. **Directory Leases**: Extend lease support for directories
2. **Lease Key Persistence**: Save lease keys for reconnection
3. **Parent-Child Relationships**: Implement hierarchical leases
4. **Lease Sharing**: Support lease sharing across handles

      return appendTo(new StringBuilder(), entries).toString();
    }

    /**
     * Returns a map joiner with the same behavior as this one, except automatically substituting
     * {@code nullText} for any provided null keys or values.
     */
    public MapJoiner useForNull(String nullText) {
      return new MapJoiner(joiner.useForNull(nullText), keyValueSeparator);
    }
  }

  // TODO(cpovirk): Rename to "toCharSequence."

	// secret key, temporary credentials become invalid if
	// server admin credentials change. This is done to ensure
	// that clients cannot decode the token using the temp
	// secret keys and generate an entirely new claim by essentially
	// hijacking the policies. We need to make sure that this is
	// based on admin credential such that token cannot be decoded

      return appendTo(new StringBuilder(), entries).toString();
    }

    /**
     * Returns a map joiner with the same behavior as this one, except automatically substituting
     * {@code nullText} for any provided null keys or values.
     */
    public MapJoiner useForNull(String nullText) {
      return new MapJoiner(joiner.useForNull(nullText), keyValueSeparator);
    }
  }

  // TODO(cpovirk): Rename to "toCharSequence."

            referralData.setLink(link);
            assertEquals(link, referralData.getLink());
        }

        @ParameterizedTest
        @NullAndEmptySource
        @DisplayName("Should handle null and empty keys")
        void testNullAndEmptyKeys(String key) {
            referralData.setKey(key);
            assertEquals(key, referralData.getKey());
        }

        @Test

        for (Map.Entry<String, Object> entry : context.entrySet()) {
            String key = entry.getKey().toLowerCase();
            Object value = entry.getValue();

            // Mask sensitive keys
            if (key.contains("password") || key.contains("secret") || key.contains("token") || key.contains("credential")) {
                masked.put(entry.getKey(), "****");
            } else if (value instanceof String) {