You are breaking contract with _some of_ your existing users, upgrading will have difficulties for _some of_ them. I regularly update across major versions of

You are breaking contract with _some of_ your existing users, upgrading will have difficulties for _some of_ them. I regularly update across major versions of packages in other languages and don't touch a thing other than the package version. I appreciate the version bump so I can do my due diligence to research the changes, but I just don't use the entire API of libraries in most cases so I'm not always affected by changes.