Prevent conflict with region (#469)

Author: jderusse

src/Input.php

@@ -11,6 +11,9 @@
  */
 abstract class Input
 {
+    /**
+     * @var string|null
+     */
     public $region;
 
     /**
@@ -23,6 +26,11 @@ protected function __construct(array $input)
         $this->region = $input['@region'] ?? null;
     }
 
+    public function setRegion(?string $region): void
+    {
+        $this->region = $region;
+    }
+
     public function getRegion(): ?string
     {
         return $this->region;