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It tells Symfony to create a "decorator" class around both our service and the core api_platform.openapi.factory service so both can be called.

It enables automatic error handling in the OpenApiFactoryDecorator by linking it to the api_platform.openapi.factory service.

It's need to hook up proper dependency injection for the OpenApiFactoryDecorator using the api_platform.openapi.factory service.

It allows the OpenApiFactoryDecorator to replace the core api_platform.openapi.factory service, but the original is passed to us.