Remove Serializable implementations

Author: derrabus

CHANGELOG.md

@@ -5,6 +5,7 @@ CHANGELOG
 ---
 
  * Remove `Address::fromString()`, use `Address::create()` instead
+ * Remove `Serializable` interface from `RawMessage`
 
 5.2.0
 -----

RawMessage.php

@@ -16,7 +16,7 @@
 /**
  * @author Fabien Potencier <[email protected]>
  */
-class RawMessage implements \Serializable
+class RawMessage
 {
     private $message;
 
@@ -60,22 +60,6 @@ public function ensureValidity()
     {
     }
 
-    /**
-     * @internal
-     */
-    final public function serialize(): string
-    {
-        return serialize($this->__serialize());
-    }
-
-    /**
-     * @internal
-     */
-    final public function unserialize($serialized)
-    {
-        $this->__unserialize(unserialize($serialized));
-    }
-
     public function __serialize(): array
     {
         return [$this->toString()];