- The core/lib directory is for classes provided by Drupal Core that are original
- to Drupal. All Drupal-originated code must follow the PSR-4 naming convention
- for classes and namespaces as documented here:
- https://github.com/php-fig/fig-standards/blob/master/accepted/PSR-4-autoloader.md
- The vendor namespace for Drupal-originated code is "Drupal".
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