Problem/Motivation
The \Drupal\Core\Cache\DatabaseCacheTagsChecksum::calculateChecksum() method uses {@inheritdoc}, and is classified as a public method:
<?php
/**
* {@inheritdoc}
*/
public function calculateChecksum(array $tags) {
?>However, there is no calculateChecksum() method on the CacheTagsChecksumInterface().
Proposed resolution
Either the method should be better documented and marked protected, or the method should be documented and added to the interface.