minor #19796 [CS] Fix explicit nullable types (smnandre)

This PR was squashed before being merged into the 6.4 branch.

Discussion
----------

[CS] Fix explicit nullable types

Fix explicit nullable types (6.4)

Commits
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4981d13 [CS] Fix explicit nullable types

Author: OskarStark

create_framework/separation_of_concerns.rst

@@ -120,7 +120,7 @@ And move the ``is_leap_year()`` function to its own class too::
 
     class LeapYear
     {
-        public function isLeapYear(int $year = null): bool
+        public function isLeapYear(?int $year = null): bool
         {
             if (null === $year) {
                 $year = date('Y');

create_framework/templating.rst

@@ -146,7 +146,7 @@ framework does not need to be modified in any way, create a new
     use Symfony\Component\HttpFoundation\Response;
     use Symfony\Component\Routing;
 
-    function is_leap_year(int $year = null): bool
+    function is_leap_year(?int $year = null): bool
     {
         if (null === $year) {
             $year = (int)date('Y');

reference/dic_tags.rst

@@ -490,7 +490,7 @@ the :class:`Symfony\\Component\\HttpKernel\\CacheWarmer\\CacheWarmerInterface` i
 
     class MyCustomWarmer implements CacheWarmerInterface
     {
-        public function warmUp(string $cacheDir, string $buildDir = null): array
+        public function warmUp(string $cacheDir, ?string $buildDir = null): array
         {
             // ... do some sort of operations to "warm" your cache
 

reference/forms/types/enum.rst

@@ -66,7 +66,7 @@ implement ``TranslatableInterface`` to translate or display custom labels::
         case Center = 'Center aligned';
         case Right = 'Right aligned';
 
-        public function trans(TranslatorInterface $translator, string $locale = null): string
+        public function trans(TranslatorInterface $translator, ?string $locale = null): string
         {
             // Translate enum from name (Left, Center or Right)
             return $translator->trans($this->name, locale: $locale);

serializer/custom_context_builders.rst

@@ -33,7 +33,7 @@ value is ``0000-00-00``. To do that you'll first have to create your normalizer:
     {
         use DenormalizerAwareTrait;
 
-        public function denormalize($data, string $type, string $format = null, array $context = []): mixed
+        public function denormalize($data, string $type, ?string $format = null, array $context = []): mixed
         {
             if ('0000-00-00' === $data) {
                 return null;
@@ -44,7 +44,7 @@ value is ``0000-00-00``. To do that you'll first have to create your normalizer:
             return $this->denormalizer->denormalize($data, $type, $format, $context);
         }
 
-        public function supportsDenormalization($data, string $type, string $format = null, array $context = []): bool
+        public function supportsDenormalization($data, string $type, ?string $format = null, array $context = []): bool
         {
             return true === ($context['zero_datetime_to_null'] ?? false)
                 && is_a($type, \DateTimeInterface::class, true);

validation/custom_constraint.rst

@@ -59,7 +59,7 @@ You can use ``#[HasNamedArguments]`` to make some constraint options required::
         #[HasNamedArguments]
         public function __construct(
             public string $mode,
-            array $groups = null,
+            ?array $groups = null,
             mixed $payload = null,
         ) {
             parent::__construct([], $groups, $payload);