FrontDoor API Item Limit Exceeded Despite Smaller Chunk Size

Putting a one second sleep in the purger in between calls appears to fix this:
AzurePurger.php:95

 $firstChunk = true;
    foreach ($chunks as $chunk) {
      /**
       * Microsoft CDN Purge endpoint will throw item limit error if multiple requests are received too quickly exceeding the 100 item limit
       */
      if(!$firstChunk){
        sleep(1);
      }
      $this->purgeChunk($chunk);
$firstChunk  = false;
    }