var deletedSubSysKeys = map[string][]string{
	APISubSys: {apiReplicationWorkers, apiReplicationFailedWorkers},
	// Add future sub-system deleted keys
}

// Merge - merges a new config with all the
// missing values for default configs,
// returns a config.
func (c Config) Merge() Config {
	cp := New()
	for subSys, tgtKV := range c {
		for tgt := range tgtKV {
			ckvs := c[subSys][tgt]
			for _, kv := range cp[subSys][Default] {

 *
 * @deprecated use {@code org.apache.maven.api.services.ModelBuilder} instead
 */
@Deprecated(since = "4.0.0")
public interface PluginConfigurationExpander {

    /**
     * Merges values from general build plugin configuration into the individual plugin executions of the given model.
     *
     * @param model The model whose build plugin configuration should be expanded, must not be <code>null</code>.

 The following are generated from this model:

   * {{{./apidocs/index.html}Java sources}} with Reader and Writers for the Xpp3 XML parser, <<<ToAPiV3()>>> and <<<ToApiV4()>>> transformers, and <<<v4>>> package
     for Merger and v4 Reader and Writers for the Xpp3 XML parser,

   * A {{{../../api/maven-api-toolchain/toolchains.html}Descriptor Reference}}

        throw new UnsupportedOperationException();
    }

    public static List<Plugin> orderAfterMerge(
            List<Plugin> merged, List<Plugin> highPrioritySource, List<Plugin> lowPrioritySource) {
        throw new UnsupportedOperationException();
    }

     * Maven 4 only supports 'override', 'merge', and 'remove' (default is merge), not 'append'.
     */
    private boolean fixUnsupportedCombineSelfAttributes(Document pomDocument, UpgradeContext context) {
        boolean fixed = false;
        Element root = pomDocument.root();

        // Find all elements with combine.self="append" and change to "merge"

 *
 * @deprecated use {@code org.apache.maven.api.services.ModelBuilder} instead
 */
@Deprecated(since = "4.0.0")
public interface ReportConfigurationExpander {

    /**
     * Merges values from general report plugin configuration into the individual reports sets of the given model.
     *
     * @param model The model whose report plugin configuration should be expanded, must not be <code>null</code>.

CHANGELOG.asciidoc  merge=union

# These files contain expected text output, and should not be changed on
# Windows

 * <ul>
 *   <li><strong>Unsupported combine.children Attributes</strong>: Changes 'override' to 'merge' (Maven 4 only supports 'append' and 'merge')</li>
 *   <li><strong>Unsupported combine.self Attributes</strong>: Changes 'append' to 'merge' (Maven 4 only supports 'override', 'merge', and 'remove')</li>

 The following are generated from this model:

   * {{{./apidocs/index.html}Java sources}} with Reader and Writers for the Xpp3 XML parser, <<<ToAPiV3()>>> and <<<ToApiV4()>>> transformers, and <<<v4>>> package
     for Merger and v4 Reader and Writers for the Xpp3 XML parser,

   * A {{{../../api/maven-api-model/maven.html}Descriptor Reference}}

  homepage: https://maven.apache.org/ref/current
  labels:
    - java
    - build-management
    - apache-maven
    - maven
    - hacktoberfest
  enabled_merge_buttons:
    squash: true
    merge: false
    rebase: true
  autolink_jira:
    - MNG
  pull_requests:
    del_branch_on_merge: true
  protected_branches:
    master: {}
    maven-4.0.x: {}
    maven-3.10.x: {}
    maven-3.9.x: {}