Holds an array of previously looked up paths for the current request path.
This will only get populated if a cache key has been set, which for example happens if the alias manager is used in the context of a request.
Type: array
protected $preloadedPathLookups = FALSE;
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https://api.drupal.org/api/drupal/core!lib!Drupal!Core!Path!AliasManager.php/property/AliasManager::preloadedPathLookups/8.1.x