// degenerate case (also disallow negative lengths)
	if len2 <= 0 {
		return crc1
	}

	even := make([]uint64, 32) // even-power-of-two zeros operator
	odd := make([]uint64, 32)  // odd-power-of-two zeros operator

	// put operator for one zero bit in odd
	odd[0] = uint64(poly) // CRC-32 polynomial
	row := uint64(1)
	for n := 1; n < 32; n++ {
		odd[n] = row
		row <<= 1
	}

        // Load persisted handles on startup
        loadPersistedHandles();

        // Schedule periodic persistence and cleanup
        scheduler.scheduleAtFixedRate(this::periodicMaintenance, 30, 30, TimeUnit.SECONDS);
    }

    /**
     * Request a new durable handle
     * @param path the file path
     * @param type the handle type
     * @param timeout the timeout in milliseconds

        Smb2LeaseKey key = leaseManager.requestLease(path, initialState);
        leaseManager.updateLease(key, initialState);

        // Call with default timeout (should use 60 seconds from config)
        leaseManager.handleLeaseBreakWithTimeout(key, newState);

        LeaseEntry entry = leaseManager.getLease(key);
        assertNotNull(entry);
        assertEquals(newState, entry.getLeaseState());

        when(dest.openUnshared(anyInt(), anyInt(), anyInt(), anyInt(), anyInt())).thenThrow(authEx) // first attempt fails with auth
                .thenReturn(handle); // second attempt succeeds

        // dest currently has READONLY attribute set
        int currentAttrs = SmbConstants.ATTR_READONLY | SmbConstants.ATTR_ARCHIVE;
        when(dest.getAttributes()).thenReturn(currentAttrs);

            UpgradeContext context = createMockContext();
            Map<Path, Document> pomMap = Map.of(Paths.get("pom.xml"), mock(Document.class));

            // Mock first strategy to fail, second to succeed
            when(mockStrategies.get(0).isApplicable(context)).thenReturn(true);
            when(mockStrategies.get(0).apply(Mockito.eq(context), Mockito.any()))
                    .thenReturn(

For example you could have a file `main.py` with:

```Python hl_lines="3"
import os

name = os.getenv("MY_NAME", "World")
print(f"Hello {name} from Python")
```

/// tip

The second argument to <a href="https://docs.python.org/3.8/library/os.html#os.getenv" class="external-link" target="_blank">`os.getenv()`</a> is the default value to return.

     * The outer map key is the virtual host key, and the value is a pair containing:
     * - First: Map of exact term matches (term -> content)
     * - Second: List of regex pattern matches (Pattern -> content template)
     */
    protected Map<String, Pair<Map<String, String>, List<Pair<Pattern, String>>>> relatedContentMap = Collections.emptyMap();

    /**

      }
      totalSize--;
    }
  }

  /**
   * {@inheritDoc}
   *
   * <p>The iterator generated by the returned collection traverses the values for one key, followed
   * by the values of a second key, and so on.
   */
  @Override
  public Collection<V> values() {
    return super.values();
  }

  @Override
  Collection<V> createValues() {
    return new Values();
  }

        this.leaseKey = key;
        this.leaseState = leaseState;
        this.cacheScope = scope;
        this.maxCacheAge = 30000; // 30 seconds default
        this.notificationEnabled = true;
        this.notificationFilter = 0;
    }

    @Override
    public byte[] getName() {
        return CONTEXT_NAME_BYTES;
    }

    /**

      }
    }
  }

  private fun ensureAllTaskQueuesIdle() {
    val entryTime = System.nanoTime()

    for (queue in TaskRunner.INSTANCE.activeQueues()) {
      // We wait at most 1 second, so we don't ever turn multiple lost threads into
      // a test timeout failure.
      val waitTime = (entryTime + 1_000_000_000L - System.nanoTime())
      if (!queue.idleLatch().await(waitTime, TimeUnit.NANOSECONDS)) {