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Change Impact
What actually changed between two releases of a spec — added, removed and reworded requirements, not a text diff. See which specs depend on it, and which of your tests are built on clauses that no longer read the way they did.
Specs with multiple versions
No specifications.
Pick a specification to compare two of its releases.
RFC lineage
An RFC is never revised — it gets obsoleted by a different RFC. So its revision history is the obsoletes/updates graph, not a version diff. Look up an RFC to see whether the document your tests enforce has been superseded.