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New in Symfony 3.4: Default request context for assets
Symfony 3.4 provides new configuration options so you can generate the right URL for assets out of the HTTP context, for example in a command console.
New in Symfony 3.4: Deprecated bundle inheritance
Symfony 3.4 deprecates bundle inheritance, but Symfony still provides lots of alternatives to override the resources of third-party bundles in your application.
New in Symfony 3.4: Better code coverage reports
Symfony 3.4 adds a new CoverageListener to the PHPUnit Bridge component to create more precise code coverage reports.
New in Symfony 3.4: PHP-based configuration for services and routes
Symfony 3.4 introduces a new (optional) PHP-based configuration format to define routes and services using a fluent interface.
New in Symfony 3.4: Advanced environment variables
Symfony 3.4 allows to define the data type of the value stored in environment variables and also defines some operators to transform their values before using them.
New in Symfony 3.4: Improved comparison constraints
In Symfony 3.4, comparison constraints can get the value of any other property without having to define a full expression.
New in Symfony 3.4: Subscribing to events in the micro kernel
In Symfony 3.4, the MicroKernel trait can subscribe to events and handle them using methods defined in the kernel class.
New in Symfony 3.4: Deprecate configuration options
In Symfony 3.4, configuration options can be deprecated more easily to warn users about future changes.
New in Symfony 3.4: HTTP Immutable Responses
Symfony 3.4 will include support for HTTP Immutable Responses thanks to the new immutable option of the Cache-Control directive.
New in Symfony 3.4: Groups support for the Valid constraint
Symfony 3.4 adds support for validation groups in the Valid constraint, so you can partially validate the embedded objects.