Add preserve_existing_declaration option to declare_strict_types

Author: paulbalandan

src/Ruleset/Nexus81.php

@@ -115,7 +115,7 @@ public function __construct()
             'date_time_immutable' => true,
             'declare_equal_normalize' => ['space' => 'none'],
             'declare_parentheses' => true,
-            'declare_strict_types' => true,
+            'declare_strict_types' => ['preserve_existing_declaration' => false],
             'dir_constant' => true,
             'doctrine_annotation_array_assignment' => false,
             'doctrine_annotation_braces' => false,