use callable in formatter signature

Author: mtarld

src/Symfony/Component/SerDes/Attribute/Formatter.php

@@ -22,12 +22,12 @@
 final class Formatter
 {
     /**
-     * @param string|array{0: string, 1: string}|null $onSerialize
-     * @param string|array{0: string, 1: string}|null $onDeserialize
+     * @param callable|null $onSerialize
+     * @param callable|null $onDeserialize
      */
     public function __construct(
-        public readonly string|array|null $onSerialize = null,
-        public readonly string|array|null $onDeserialize = null,
+        public readonly mixed $onSerialize = null,
+        public readonly mixed $onDeserialize = null,
     ) {
         if (null !== $onSerialize && !\is_callable($onSerialize)) {
             throw new InvalidArgumentException(sprintf('Parameter "$onSerialize" of attribute "%s" must be a valid callable.', self::class));

src/Symfony/Component/SerDes/Context/ContextBuilder/Deserialize/DeserializeFormatterAttributeContextBuilder.php

@@ -23,7 +23,7 @@
 final class DeserializeFormatterAttributeContextBuilder implements DeserializeContextBuilderInterface
 {
     /**
-     * @var array<string, string|array{0: string, 1: string}>
+     * @var array<string, callable>
      */
     private static ?array $cache = null;
 
@@ -52,7 +52,7 @@ public function build(array $context): array
     /**
      * @param class-string $className
      *
-     * @return array<string, string|array{0: string, 1: string}>
+     * @return array<string, callable>
      */
     private function propertyFormatters(string $className): array
     {

src/Symfony/Component/SerDes/Context/ContextBuilder/Serialize/SerializeFormatterAttributeContextBuilder.php

@@ -23,7 +23,7 @@
 final class SerializeFormatterAttributeContextBuilder implements SerializeContextBuilderInterface
 {
     /**
-     * @var array<string, string|array{0: string, 1: string}>
+     * @var array<string, callable>
      */
     private static ?array $cache = null;
 
@@ -56,7 +56,7 @@ public function build(array $context): array
     /**
      * @param class-string $className
      *
-     * @return array<string, string|array{0: string, 1: string}>
+     * @return array<string, callable>
      */
     private function propertyFormatters(string $className): array
     {