Added the has method

app/Classes/MetadataManager.php

@@ -147,6 +147,17 @@ public function get($key, $default = null, bool $respectDots = true)
         }
     }
 
+    /**
+     * Indicates if a particular key exists in metadata store.
+     *
+     * @param  mixed  $key  The key of the value to retrieve.
+     * @return mixed The value of the specified key, or the default value.
+     */
+    public function has($key)
+    {
+        return array_key_exists($key, $this->content);
+    }
+
     /**
      * Retrieves all metadata as an associative array.
      *