WIP

Author: cybtachyon

src/PatternLibraryCollector.php

@@ -111,7 +111,7 @@ public function __construct(
    */
   public static function create(ContainerInterface $container): self {
     /** @var \Drupal\Core\Cache\CacheBackendInterface $cache */
-    $cache = $container->get('cache.discovery');
+    $cache = $container->get('cache.default');
     /** @var \Drupal\Core\Config\ConfigFactoryInterface $config_factory */
     $config_factory = $container->get('config.factory');
     /** @var \Drupal\patternkit\PatternLibraryPluginManager $library_plugin_manager */
@@ -159,8 +159,13 @@ public function getLibraryDefinitions(): array {
       // (if cache enabled, otherwise just a slow, redundant memcache set).
       if ($cache_enabled) {
         // Explicit copy of the data into cache_set to avoid implicit copy.
+        // @todo Evaluate encoding via JSON instead to shrink data size.
         $this->cache->set(static::PERSISTENT_CACHE_ID,
           $cached_metadata);
+        $cache = $this->cache->get(static::PERSISTENT_CACHE_ID);
+        if ($cache->data !== $cached_metadata) {
+          // @todo THROW AN ERROR CAUSE WE BROKE.
+        }
       }
     }
     return $cached_metadata;