feature #59670 [Serializer] Add NumberNormalizer (valtzu)

This PR was merged into the 7.3 branch.

Discussion
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[Serializer] Add `NumberNormalizer`

| Q             | A
| ------------- | ---
| Branch?       | 7.3
| Bug fix?      | no
| New feature?  | yes
| Deprecations? | no
| Issues        | Fix #59651
| License       | MIT

Normalize `BcMath\Number` to `string`.

A few changes in comparison to the original issue description:

1. `float`s not supported at all. No point using precision math if you start with non-precise value.
2. `Number` is always normalized to a `string`. If we wanted the `int` cast, it should be opt-in with some context key like `cast_zero_scale_to_int` – though I personally don't see a need for it.

Commits
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d3e3dfe09f4 Add `NumberNormalizer`

Author: fabpot

DependencyInjection/FrameworkExtension.php

@@ -170,6 +170,7 @@
 use Symfony\Component\Serializer\NameConverter\SnakeCaseToCamelCaseNameConverter;
 use Symfony\Component\Serializer\Normalizer\DenormalizerInterface;
 use Symfony\Component\Serializer\Normalizer\NormalizerInterface;
+use Symfony\Component\Serializer\Normalizer\NumberNormalizer;
 use Symfony\Component\Serializer\Serializer;
 use Symfony\Component\Stopwatch\Stopwatch;
 use Symfony\Component\String\LazyString;
@@ -1933,6 +1934,11 @@ private function registerSerializerConfiguration(array $config, ContainerBuilder
             $container->removeDefinition('serializer.normalizer.mime_message');
         }
 
+        // BC layer Serializer < 7.3
+        if (!class_exists(NumberNormalizer::class)) {
+            $container->removeDefinition('serializer.normalizer.number');
+        }
+
         // BC layer Serializer < 7.2
         if (!class_exists(SnakeCaseToCamelCaseNameConverter::class)) {
             $container->removeDefinition('serializer.name_converter.snake_case_to_camel_case');

Resources/config/serializer.php

@@ -44,6 +44,7 @@
 use Symfony\Component\Serializer\Normalizer\JsonSerializableNormalizer;
 use Symfony\Component\Serializer\Normalizer\MimeMessageNormalizer;
 use Symfony\Component\Serializer\Normalizer\NormalizerInterface;
+use Symfony\Component\Serializer\Normalizer\NumberNormalizer;
 use Symfony\Component\Serializer\Normalizer\ObjectNormalizer;
 use Symfony\Component\Serializer\Normalizer\ProblemNormalizer;
 use Symfony\Component\Serializer\Normalizer\PropertyNormalizer;
@@ -221,5 +222,8 @@
 
         ->set('serializer.normalizer.backed_enum', BackedEnumNormalizer::class)
             ->tag('serializer.normalizer', ['built_in' => true, 'priority' => -915])
+
+        ->set('serializer.normalizer.number', NumberNormalizer::class)
+            ->tag('serializer.normalizer', ['built_in' => true, 'priority' => -915])
     ;
 };