Symfony 5.1.0-RC2 released

Symfony 5.1.0-RC2 has just been released. Here is a list of the most important changes:

• bug #36966 Fix extra SQL support in Doctrine migrations (@fabpot)
• bug #36960 [HttpClient] fix management of shorter-than-requested timeouts with AmpHttpClient (@nicolas-grekas)
• bug #36947 [Mime] Allow email message to have "To", "Cc", or "Bcc" header to be valid (@Ernest Hymel)
• bug #36943 [FrameworkBundle] Fix MicroKernelTrait for php 8 (@derrabus)
• bug #36938 Don't call metho _exists() with non-objects. (@derrabus)
• bug #36936 [FrameworkBundle] don't use abstract methods in MicroKernelTrait, their semantics changed in PHP 8 (@nicolas-grekas)
• bug #36935 [HttpClient] Adjust AmpResponse to the stricter trait handling in php 8 (@derrabus)
• bug #36914 Parse and render anonymous classes correctly on php 8 (@derrabus)
• bug #36921 [OptionsResolver][Serializer] Remove calls to deprecated ReflectionParameter::getClass() (@derrabus)
• feature #36918 [Security] Removed "services" prototype node from "custo _authenticator" (@wouterj)
• bug #36920 [VarDumper] fix PHP 8 support (@nicolas-grekas)
• bug #36917 [Cache] Accessing undefined constants raises an Error in php8 (@derrabus)
• bug #36891 Address deprecation of ReflectionType::getClass() (@derrabus)
• bug #36899 [VarDumper] ReflectionFunction::isDisabled() is deprecated (@derrabus)
• bug #36905 [Validator] Catch expected ValueError (@derrabus)
• bug #36915 [DomCrawler] Catch expected ValueError (@derrabus)
• bug #36908 [Cache][HttpClient] Made method signatures compatible with their corresponding traits (@derrabus)
• bug #36906 [DomCrawler] Catch expected ValueError (@derrabus)
• bug #36904 [PropertyAccess] Parse php 8 TypeErrors correctly (@derrabus)
• bug #36839 [BrowserKit] Raw body with custom Content-Type header (@azhurb)
• bug #36869 [Form] don't add the inputmode attribute on fields whose type is the same (@MatTheCat)
• feature #36886 [Validator] Make ExpressionLanguageSyntax validator usable with annotation (@jderusse)
• bug #36896 [Config] Removed implicit cast of ReflectionProperty to string (@derrabus)
• bug #35944 [Security/Core] Fix wrong roles comparison (@thlbaut)
• bug #36873 [Messenger] Fixed check for allowed options in AwsSqs configuration (@kroshilin)
• bug #36882 [PhpUnitBridge] fix installing under PHP >= 8 (@nicolas-grekas)
• bug #36859 [Validator] allow passing a validator to Validation::createCallable() (@nicolas-grekas)
• bug #36833 [HttpKernel] Fix that the Store would not save responses with the X-Content-Digest header present (@mpdude)
• bug #36867 [PhpUnitBridge] fix bad detection of unsilenced deprecations (@nicolas-grekas)
• bug #36862 [Security] Unserialize $parentData, if needed, to avoid errors (@rfaivre)
• bug #36855 [HttpKernel] Fix error logger when stderr is redirected to /dev/null (@fabpot)
• bug #36838 [HttpKernel] Bring back the debug toolbar (@derrabus)

Want to upgrade to this new release? Because Symfony protects backwards-compatibility very closely, this should be quite easy. Use
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