> That seems to be a workaround for not having an adequate testing framework or a contract Sometimes you get that contract wrong, and you don't realize it unti

> That seems to be a workaround for not having an adequate testing framework or a contract Sometimes you get that contract wrong, and you don't realize it until you've shipped it. If you want to evolve an API by introducing a breaking change, you can do it at Google. You just have to migrate the clients with the API change. It means your APIs can both improve and stay lean, without needing to carry around legacy cruft, which is great. It's not really an option in open source.