BlockKit classes is now countable

src/BlockKit.php

@@ -12,7 +12,7 @@ use Slack\Exceptions\SlackSyntaxException;
  *
  * @package Slack
  */
-abstract class BlockKit implements \JsonSerializable
+abstract class BlockKit implements \JsonSerializable,\Countable
 {
 	protected Collection $_data;
 

src/Message.php

@@ -143,7 +143,7 @@ final class Message extends BlockKit
 	public function jsonSerialize()
 	{
 		// For interactive messages that generate a dialog, we need to return NULL
-		return $this->_data->count() ? parent::jsonSerialize() : NULL;
+		return count($this) ? parent::jsonSerialize() : NULL;
 	}
 
 	/**