}

  /**
   * Returns a new {@code MutableClassToInstanceMap} instance backed by a given empty {@code
   * backingMap}. The caller surrenders control of the backing map, and thus should not allow any
   * direct references to it to remain accessible.
   */
  public static <B extends @Nullable Object> MutableClassToInstanceMap<B> create(
      Map<Class<? extends @NonNull B>, B> backingMap) {
    return new MutableClassToInstanceMap<>(backingMap);

      <property name="ignoreComments" value="true" />
    </module>
    <module name="RegexpSinglelineJava">
      <property name="format" value="java\.io\.Serializable;" />
      <property name="message" value="References java.io.Serializable." />
      <property name="ignoreComments" value="true" />
    </module>
    <!-- end Orwellian suppression of Serializable -->

    <!-- Forbid equality comparisons with `true` -->

/**
 * An immutable object that may contain a non-null reference to another object. Each instance of
 * this type either contains a non-null reference, or contains nothing (in which case we say that
 * the reference is "absent"); it is never said to "contain {@code null}".
 *
 * <p>A non-null {@code Optional<T>} reference can be used as a replacement for a nullable {@code T}

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    </div>
    <div class="item">
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     * </ul>
     * <p>
     * The implementation must handle:
     * <ul>
     *   <li>Both forward and back slashes as path separators</li>
     *   <li>Parent directory references (..)</li>
     *   <li>Both file and directory targets</li>
     * </ul>
     *
     * @param relative path to resolve relative to this source
     * @return the resolved source, or null if resolution not possible

 * callers. Instead, accept {@link Iterable} and have your method or constructor body pass it to the
 * appropriate {@code copyOf} method itself.
 *
 * <p>Expressing the immutability guarantee directly in the type that user code references is a
 * powerful advantage. Although Java offers certain immutable collection factory methods, such as
 * {@link Collections#singleton(Object)} and <a

1. **Title and Summary**:
   - Use a scannable title: `[Subsystem] Action Description #Issue` (e.g., `[IAM] Add role-based access control #567`).
   - Include context in the summary: what changed, why, and any issue references.
   - Use `[WIP]` for in-progress PRs to avoid premature merging or choose GitHub draft PRs.

2. **Commits**:

    /** The request header service for managing request header settings. */
    @Resource
    private RequestHeaderService reqHeaderService;
    /** The web config service for validating web configuration references. */
    @Resource
    private WebConfigService webConfigService;

    // ===================================================================================

    /** The web authentication service for managing web authentication settings. */
    @Resource
    private WebAuthenticationService webAuthService;
    /** The web config service for validating web configuration references. */
    @Resource
    private WebConfigService webConfigService;

    // ===================================================================================