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We already skipped history integration tests in core CI in #675 due to suspicion on nested IRB sessions don't work on certain operating systems.
But after #669, the evaluation integration test also started to fail on some Core CI suites (example). So, it looks like the integration test setup may not work in Core CI, at least in some suites.
Consider
ruby/irb
already has rather sophisticated test suite, I think it's better to skip the integration tests in core CI for now.