Merge branch '5.0' into 5.1

* 5.0: (28 commits)
  [Cache] $lifetime cannot be null
  [Serializer] minor cleanup
  fix merge
  Run PHP 8 as 7.4.99
  Remove calls to deprecated ReflectionParameter::getClass().
  [VarDumper] fix PHP 8 support
  Add php 8 to travis.
  [Cache] Accessing undefined constants raises an Error in php8
  [Cache] allow DBAL v3
  Skip Doctrine DBAL on php 8 until we have a compatible version.
  [DomCrawler] Catch expected ValueError.
  Made method signatures compatible with their corresponding traits.
  [ErrorHandler] Apply php8 fixes from Debug component.
  [DomCrawler] Catch expected ValueError.
  [Validator] Catch expected ValueError.
  [VarDumper] ReflectionFunction::isDisabled() is deprecated.
  [BrowserKit] Raw body with custom Content-Type header
  [PropertyAccess] Parse php 8 TypeErrors correctly.
  [Intl] Fix call to ReflectionProperty::getValue() for static properties.
  [HttpKernel] Prevent calling method_exists() with non-string values.
  ...

Author: nicolas-grekas

Normalizer/AbstractNormalizer.php

@@ -411,16 +411,10 @@ protected function instantiateObject(array &$data, string $class, array &$contex
     protected function denormalizeParameter(\ReflectionClass $class, \ReflectionParameter $parameter, string $parameterName, $parameterData, array $context, string $format = null)
     {
         try {
-            if (\PHP_VERSION_ID < 70100 && null !== $parameterClass = $parameter->getClass()) {
-                $parameterClass = $parameterClass->name;
-            } elseif (\PHP_VERSION_ID >= 70100 && $parameter->hasType() && ($parameterType = $parameter->getType()) && !$parameterType->isBuiltin()) {
+            if (($parameterType = $parameter->getType()) && !$parameterType->isBuiltin()) {
                 $parameterClass = $parameterType->getName();
                 new \ReflectionClass($parameterClass); // throws a \ReflectionException if the class doesn't exist
-            } else {
-                $parameterClass = null;
-            }
 
-            if (null !== $parameterClass) {
                 if (!$this->serializer instanceof DenormalizerInterface) {
                     throw new LogicException(sprintf('Cannot create an instance of "%s" from serialized data because the serializer inject in "%s" is not a denormalizer.', $parameterClass, static::class));
                 }