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  public function merge( $incoming ) {
    $incoming_data    = $incoming->get_raw_data();
    $this->theme_json = array_replace_recursive( $this->theme_json, $incoming_data );

    /*
		 * The array_replace_recursive algorithm merges at the leaf level,
		 * but we don't want leaf arrays to be merged, so we overwrite it.
		 *
		 * For leaf values that are sequential arrays it will use the numeric indexes for replacement.
		 * We rather replace the existing with the incoming value, if it exists.
		 * This is the case of spacing.units.
		 *
		 * For leaf values that are associative arrays it will merge them as expected.
		 * This is also not the behavior we want for the current associative arrays (presets).
		 * We rather replace the existing with the incoming value, if it exists.
		 * This happens, for example, when we merge data from theme.json upon existing
		 * theme supports or when we merge anything coming from the same source twice.
		 * This is the case of color.palette, color.gradients, color.duotone,
		 * typography.fontSizes, or typography.fontFamilies.
		 *
		 * Additionally, for some preset types, we also want to make sure the
		 * values they introduce don't conflict with default values. We do so
		 * by checking the incoming slugs for theme presets and compare them
		 * with the equivalent default presets: if a slug is present as a default
		 * we remove it from the theme presets.
		 */
    $nodes        = static::get_setting_nodes( $incoming_data );
    $slugs_global = static::get_default_slugs( $this->theme_json, array( 'settings' ) );
    foreach ( $nodes as $node ) {
      // Replace the spacing.units.
      $path   = $node['path'];
      $path[] = 'spacing';
      $path[] = 'units';

      $content = _wp_array_get( $incoming_data, $path, null );
      if ( isset( $content ) ) {
        _wp_array_set( $this->theme_json, $path, $content );
      }

      // Replace the presets.
      foreach ( static::PRESETS_METADATA as $preset ) {
        $override_preset = ! static::get_metadata_boolean( $this->theme_json['settings'], $preset['prevent_override'], true );

        foreach ( static::VALID_ORIGINS as $origin ) {
          $base_path = $node['path'];
          foreach ( $preset['path'] as $leaf ) {
            $base_path[] = $leaf;
          }

          $path   = $base_path;
          $path[] = $origin;

          $content = _wp_array_get( $incoming_data, $path, null );
          if ( ! isset( $content ) ) {
            continue;
          }

          if ( 'theme' === $origin && $preset['use_default_names'] ) {
            foreach ( $content as $key => $item ) {
              if ( ! isset( $item['name'] ) ) {
                $name = static::get_name_from_defaults( $item['slug'], $base_path );
                if ( null !== $name ) {
                  $content[ $key ]['name'] = $name;
                }
              }
            }
          }

          if (
            ( 'theme' !== $origin ) ||
            ( 'theme' === $origin && $override_preset )
          ) {
            _wp_array_set( $this->theme_json, $path, $content );
          } else {
            $slugs_node = static::get_default_slugs( $this->theme_json, $node['path'] );
            $slugs      = array_merge_recursive( $slugs_global, $slugs_node );

            $slugs_for_preset = _wp_array_get( $slugs, $preset['path'], array() );
            $content          = static::filter_slugs( $content, $slugs_for_preset );
            _wp_array_set( $this->theme_json, $path, $content );
          }
        }
      }
    }
  }