- Added multi-part by default to forms

- Fixed some bug within FormContext and FormHandler.

src/Method/FormContext.php

@@ -17,8 +17,6 @@ class FormContext implements FormContextInterface
     
     public ? ResponseInterface $response = null;
 
-    protected int $action;
-    
     public function __construct(ServerRequestInterface $request) 
     {
         $this->request = $request;
@@ -68,7 +66,7 @@ class FormContext implements FormContextInterface
 
     public function set(string $key, $value)
     {
-        return $_SESSION[$key] = $value;
+        return $this->values[$key] = $value;
     }
 
     public function delete(string $key) : void