check the raw attributes and casts array as it is much faster

Author: taylorotwell

src/Illuminate/Database/Eloquent/Concerns/HasAttributes.php

@@ -353,7 +353,8 @@ public function getAttribute($key)
         // If the attribute exists in the attribute array or has a "get" mutator we will
         // get the attribute's value. Otherwise, we will proceed as if the developers
         // are asking for a relationship's value. This covers both types of values.
-        if (array_key_exists($key, $this->getAttributes()) ||
+        if (array_key_exists($key, $this->attributes) ||
+            array_key_exists($key, $this->casts) ||
             $this->hasGetMutator($key) ||
             $this->isClassCastable($key)) {
             return $this->getAttributeValue($key);