* 4.4.12 (2020-08-31)

* bug #37966 [HttpClient][MockHttpClient][DX] Throw when the response factory callable does not return a valid response (fancyweb)

* bug #37971 [PropertyInfo] Backport support for typed properties (PHP 7.4) (dunglas)

* bug #37970 [PhpUnitBridge] Polyfill new phpunit 9.1 assertions (phpfour)

* bug #37960 [PhpUnit] Add polyfill for assertMatchesRegularExpression() (dunglas)

* bug #37949 [Yaml] fix more numeric cases changing in PHP 8 (xabbuh)

* bug #37921 [Yaml] account for is_numeric() behavior changes in PHP 8 (xabbuh)

* bug #37912 [ExpressionLanguage] fix passing arguments to call_user_func_array() on PHP 8 (xabbuh)

* bug #37907 [Messenger] stop using the deprecated schema synchronizer API (xabbuh)

* bug #37900 [Mailer] Fixed mandrill api header structure (wulff)

* bug #37888 [Mailer] Reorder headers used to determine Sender (cvmiert)

* bug #37872 [Sendgrid-Mailer] Fixed envelope recipients on sendgridApiTransport (arendjantetteroo)

* bug #37860 [Serializer][ClassDiscriminatorMapping] Fix getMappedObjectType() when a discriminator child extends another one (fancyweb)

* bug #37853 [Validator] ensure that the validator is a mock object for backwards-compatibility (xabbuh)

* bug #36340 [Serializer] Fix configuration of the cache key (dunglas)

* bug #36810 [Messenger] Do not stack retry stamp (jderusse)

* bug #37849 [FrameworkBundle] Add missing mailer transports in xsd (l-vo)

* bug #37586 [ErrorHandler][DebugClassLoader] Add mixed and static return types support (fancyweb)

* bug #37845 [Serializer] Fix variadic support when using type hints (fabpot)

* bug #37841 [VarDumper] Backport handler lock when using VAR_DUMPER_FORMAT (ogizanagi)

* bug #37725 [Form] Fix Guess phpdoc return type (franmomu)

* bug #37771 Use PHPUnit 9.3 on php 8 (derrabus)

* bug #36140 [Validator] Add BC layer for notInRangeMessage when min and max are set (l-vo)

* bug #35843 [Validator] Add target guards for Composite nested constraints (ogizanagi)

* bug #37803 Fix for issue #37681 (Rav)

* bug #37744 [Yaml] Fix for #36624; Allow PHP constant as first key in block (jnye)

* bug #37767 [Form] fix mapping errors from unmapped forms (xabbuh)

* bug #37731 [Console] Table: support cells with newlines after a cell with colspan >= 2 (GMTA)

* bug #37791 Fix redis connect with empty password (alexander-schranz)

* bug #37790 Fix deprecated libxml_disable_entity_loader (fabpot)

* bug #37763 Fix deprecated libxml_disable_entity_loader (jderusse)

* bug #37774 [Console] Make sure we pass a numeric array of arguments to call_user_func_array() (derrabus)

* bug #37729 [FrameworkBundle] fail properly when the required service is not defined (xabbuh)

* bug #37701 [Serializer] Fix that it will never reach DOMNode (TNAJanssen)

* bug #37671 [Cache] fix saving no-expiry items with ArrayAdapter (philipp-kolesnikov)

* bug #37102 [WebProfilerBundle] Fix error with custom function and web profiler routing tab (JakeFr)

* bug #37560 [Finder] Fix GitIgnore parser when dealing with (sub)directories and take order of lines into account (Jeroeny)

* bug #37700 [VarDumper] Improve previous fix on light array coloration (l-vo)

* bug #37705 [Mailer] Added the missing reset tag to mailer.logger_message_listener (vudaltsov)

* bug #37697 [Messenger] reduce column length for MySQL 5.6 compatibility (xabbuh)