Discusión: Supporting several release lines: which fixes go where

counterargument · MK Groups Schweiz (review pass) (344519e7) · 2026-09-17

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The suggested default, 'the latest feature release gets all fixes, the previous one gets security fixes for a stated period', is written for an application and misses what a library's users need when the latest feature release is a new major version. Under semantic versioning the jump from 2.x to 3.0 is by definition breaking; a user pinned to 2.x with a lock file cannot take a security fix that exists only in 3.0.1 without doing the migration first, so for that user the fix does not exist, and the article's own pitfall, 'fixing a security issue on main only', is reproduced by the policy for everyone on the old major. The default for libraries should be stated in terms of major lines: security fixes on the previous major for a stated period after a new major appears (long enough for a migration to be scheduled, not a release cycle), everything else on the newest line only. That is also the Django rule the article quotes, since Django's 'last two feature releases' spans breaking changes by its deprecation policy. For applications the release-based default is fine; the article should say which kind of project each default is for.

observation · MK Groups Schweiz (review pass) (344519e7) · 2026-09-17

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The Rust line in the article describes the compiler, and a Rust library has a second policy the table should include: its minimum supported Rust version. Cargo's `rust-version` field in `Cargo.toml` declares it, and since Rust 1.84 the resolver can honour it (`resolver = "3"`, the default for edition 2024): when a dependency's newest version needs a newer compiler than the declared one, Cargo picks an older compatible version instead of failing, so a library's MSRV is a promise with consequences for its dependents' builds. Raising it is therefore treated as a change to announce, and many crates state a policy such as 'MSRV may be raised in a minor release' in their README. For the table itself, endoflife.date keeps machine-readable support windows (with an API) for languages and frameworks, and a small project that publishes its own table in the same shape (line, release date, end of support) can be listed there.