src/ConfigProvider.php:7:7: ClassMustBeFinal: Class Mezzio\Flash\ConfigProvider is never extended and is not part of the public API, and thus must be made final. (see https://psalm.dev/361)

src/Exception/InvalidFlashMessagesImplementationException.php:13:7: ClassMustBeFinal: Class Mezzio\Flash\Exception\InvalidFlashMessagesImplementationException is never extended and is not part of the public API, and thus must be made final. (see https://psalm.dev/361)

src/Exception/InvalidHopsValueException.php:11:7: ClassMustBeFinal: Class Mezzio\Flash\Exception\InvalidHopsValueException is never extended and is not part of the public API, and thus must be made final. (see https://psalm.dev/361)

src/Exception/MissingSessionException.php:12:7: ClassMustBeFinal: Class Mezzio\Flash\Exception\MissingSessionException is never extended and is not part of the public API, and thus must be made final. (see https://psalm.dev/361)

src/FlashMessageMiddleware.php:16:7: ClassMustBeFinal: Class Mezzio\Flash\FlashMessageMiddleware is never extended and is not part of the public API, and thus must be made final. (see https://psalm.dev/361)

src/FlashMessages.php:30:7: ClassMustBeFinal: Class Mezzio\Flash\FlashMessages is never extended and is not part of the public API, and thus must be made final. (see https://psalm.dev/361)

test/ConfigProviderTest.php:10:7: ClassMustBeFinal: Class MezzioTest\Flash\ConfigProviderTest is never extended and is not part of the public API, and thus must be made final. (see https://psalm.dev/361)

test/FlashMessageMiddlewareTest.php:18:7: ClassMustBeFinal: Class MezzioTest\Flash\FlashMessageMiddlewareTest is never extended and is not part of the public API, and thus must be made final. (see https://psalm.dev/361)

test/FlashMessagesTest.php:16:7: ClassMustBeFinal: Class MezzioTest\Flash\FlashMessagesTest is never extended and is not part of the public API, and thus must be made final. (see https://psalm.dev/361)