Issue #3261691: Optimize tag invalidation

    $params = ['items' => []];

    switch ($type) {

      case 'tags':

        $tags = [];

        // Collect all tags.

        foreach ($invalidations as $invalidation) {

          $tag = $this->createHashTag($invalidation);

          $tags[] = $this->createHashTag($invalidation);

        }

        // Create purge selector to have 1 url per request.

        $purgeSelector = [

          'selectorType' => 'TAG',

          'selectorName' => 'X-Tag',

            'selectorValue' => $tag,

          'selectorValue' => implode(',', $tags),

          'selectorValueDelimiter' => ',',

        ];

        $params['items'][] = [

          'recursive' => TRUE,

          'invalidateOnly' => FALSE,

        ];

        }

        break;

      case 'url':