Get release notes. Use this when the user asks what changed between two versions of a package, or what to watch for in an upgrade, such as "what changed in express between 4.18.2 and 5.1.0?" or "are there breaking changes from requests 2.28 to 2.32?". Pass the npm or PyPI package name (or a GitHub repo) and fromVersion, the version the user has; toVersion defaults to the latest release. Returns each release after fromVersion up to toVersion, newest first, with its date, link, a short excerpt of its notes and a breaking flag, plus a GitHub compare link. Notes come from GitHub releases and, when those do not reach back far enough, from the repository's changelog file; complete is false when neither covers the whole range. Not for vulnerabilities.
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