Merge branch '7.0' into 7.1

* 7.0:
  [Serializer] Improve exception message in UnwrappingDenormalizer
  [PropertyInfo] Update DoctrineExtractor for new DBAL 4 BIGINT type
  Update security.nl.xlf
  [Validator] IBAN Check digits should always between 2 and 98
  [Security] Populate translations for trans-unit 20
  add missing plural translation messages
  filter out empty HTTP header parts
  [String] Fix folded in compat mode
  Remove calls to `getMockForAbstractClass()`
  [ErrorHandler] Do not call xdebug_get_function_stack() with xdebug >= 3.0 when not in develop mode
  [Serializer] Fix type for missing property
  add test for JSON response with null as content
  [Filesystem] Fix dumpFile `stat failed` error hitting custom handler
  Return false in isTtySupported() when open_basedir restrictions prevent access to /dev/tty.
  Remove calls to `TestCase::iniSet()` and calls to deprecated methods of `MockBuilder`
  [PhpUnitBridge] Fix `DeprecationErrorHandler` with PhpUnit 10

AbstractUnicodeString.php

@@ -190,7 +190,7 @@ public function folded(bool $compat = true): static
 
         if (!$compat || !\defined('Normalizer::NFKC_CF')) {
             $str->string = normalizer_normalize($str->string, $compat ? \Normalizer::NFKC : \Normalizer::NFC);
-            $str->string = mb_strtolower(str_replace(self::FOLD_FROM, self::FOLD_TO, $this->string), 'UTF-8');
+            $str->string = mb_strtolower(str_replace(self::FOLD_FROM, self::FOLD_TO, $str->string), 'UTF-8');
         } else {
             $str->string = normalizer_normalize($str->string, \Normalizer::NFKC_CF);
         }

Tests/AbstractUnicodeTestCase.php

@@ -582,10 +582,10 @@ public static function provideBeforeAfterLastIgnoreCase(): array
         );
     }
 
-    public static function provideToFoldedCase(): array
+    public static function provideFolded(): array
     {
         return array_merge(
-            parent::provideToFoldedCase(),
+            parent::provideFolded(),
             [
                 ['déjà', 'DéjÀ'],
                 ['σσσ', 'Σσς'],