Fix nullCoalesce.variable errors.

rm nullCoalesce.variable.neon

Update error count

Restore missing nullCoalesce.variable.neon file

Update loader.neon and remove obsolete nullCoalesce.variable.neon

Use type checking instead of null coalescing

Prevent superglobals from being changed by users

Author: warcooft

system/HTTP/RedirectResponse.php

@@ -93,8 +93,8 @@ public function withInput()
     {
         $session = service('session');
         $session->setFlashdata('_ci_old_input', [
-            'get'  => $_GET ?? [],
-            'post' => $_POST ?? [],
+            'get'  => isset($_GET) ? $_GET : [],
+            'post' => isset($_POST) ? $_POST : [],
         ]);
 
         $this->withErrors();

utils/phpstan-baseline/loader.neon

@@ -1,4 +1,4 @@
-# total 3575 errors
+# total 3573 errors
 includes:
     - argument.type.neon
     - assign.propertyType.neon
@@ -23,7 +23,6 @@ includes:
     - missingType.return.neon
     - notIdentical.alwaysTrue.neon
     - nullCoalesce.property.neon
-    - nullCoalesce.variable.neon
     - offsetAccess.notFound.neon
     - property.defaultValue.neon
     - property.nonObject.neon