Allow syndication links to be updated more easily/reliably bu casting syndicates to array

app/Bookmark.php

@@ -13,6 +13,15 @@ class Bookmark extends Model
      */
     protected $fillable = ['url', 'name', 'content'];
 
+    /**
+     * The attributes that should be cast to native types.
+     *
+     * @var array
+     */
+    protected $casts = [
+        'syndicates' => 'array',
+    ];
+
     /**
      * The tags that belong to the bookmark.
      */