[ErrorHandler] Rewrite logic to dump exception properties and fix serializing FlattenException

Author: nicolas-grekas

Caster/ExceptionCaster.php

@@ -306,7 +306,7 @@ private static function filterExceptionArray(string $xClass, array $a, string $x
         if (empty($a[$xPrefix.'previous'])) {
             unset($a[$xPrefix.'previous']);
         }
-        unset($a[$xPrefix.'string'], $a[Caster::PREFIX_DYNAMIC.'xdebug_message'], $a[Caster::PREFIX_DYNAMIC.'__destructorException']);
+        unset($a[$xPrefix.'string'], $a[Caster::PREFIX_DYNAMIC.'xdebug_message']);
 
         if (isset($a[Caster::PREFIX_PROTECTED.'message']) && str_contains($a[Caster::PREFIX_PROTECTED.'message'], "@anonymous\0")) {
             $a[Caster::PREFIX_PROTECTED.'message'] = preg_replace_callback('/[a-zA-Z_\x7f-\xff][\\\\a-zA-Z0-9_\x7f-\xff]*+@anonymous\x00.*?\.php(?:0x?|:[0-9]++\$)[0-9a-fA-F]++/', fn ($m) => class_exists($m[0], false) ? (get_parent_class($m[0]) ?: key(class_implements($m[0])) ?: 'class').'@anonymous' : $m[0], $a[Caster::PREFIX_PROTECTED.'message']);

Cloner/VarCloner.php

@@ -16,7 +16,6 @@
  */
 class VarCloner extends AbstractCloner
 {
-    private static string $gid;
     private static array $arrayCache = [];
 
     protected function doClone(mixed $var): array
@@ -41,7 +40,6 @@ protected function doClone(mixed $var): array
         $stub = null;                   // Stub capturing the main properties of an original item value
                                         // or null if the original value is used directly
 
-        $gid = self::$gid ??= hash('xxh128', random_bytes(6)); // Unique string used to detect the special $GLOBALS variable
         $arrayStub = new Stub();
         $arrayStub->type = Stub::TYPE_ARRAY;
         $fromObjCast = false;