How Open Source Projects Handle API Stability Promises

Lucas and Luna explore the delicate balance open source projects face when promising API stability. Using the Linux kernel's 'no regressions' policy and the Node.js semver approach as contrasting case studies, they unpack how projects like Kubernetes and Python manage the tension between innovation and breaking changes. They discuss the real-world cost of instability for downstream consumers and the governance tools projects use to signal reliability without freezing development. Specific examples include the 2019 Python 2 sunset, the semver.org spec, and how the Apache Software Foundation handles versioning across hundreds of projects. A practical look at how maintainers think about trust, compatibility, and the social contract with users.

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