Add CI check for RI backward compatibility#1625
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Prevents regressions like #1535 where Marshal format changes (e.g., Heading Struct → class) break ri when reading data generated by older RDoc versions. The check generates ri data using old RDoc gem versions, then installs the current RDoc and verifies it can still read that data.
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Adds a CI workflow that catches Marshal format incompatibilities between old and new RDoc versions, preventing regressions like #1535.
How it works
lib/Verification
Temporarily removing the
RUBY_VERSIONguard fromHeading(reverting it from Struct to always-Class) causes the check to fail as expected:https://github.com/ruby/rdoc/actions/runs/22323179123