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# Final classes The `final` keyword was removed in version 1.4.0. It was replaced by `@final` annotation. This was done due popular demand, not because it is a good technical reason to extend the classes. This document will show the correct way to work with PSR-7 classes. The "correct way" refers to best practices and good software design. I strongly believe that one should be aware of how a problem *should* be solved, however, it is not needed to always implement that solution. ## Extending classes You should never extend the classes, you should rather use composition or implement the interface yourself. Please refer to the [decorator pattern](https://refactoring.guru/design-patterns/decorator). ## Mocking classes The PSR-7 classes are all value objects and they can be used without mocking. If one really needs to create a special scenario, one can mock the interface instead.