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Hi Antoine, I was speaking with @thcipriani about this and he said you'd probably be the best person to ask. On the payments cluster we run mediawiki 1.25 with a few extensions (DonationInterface and friends). Occasionally CI will report false positive for regressions in our extensions because of interstitial changes to 1.27. We usually just patch the extensions to support both versions but this gets cumbersome and I worry it might have the potential to hide actual bugs. I was wondering how hard it would be to tell Jenkins to test certain extensions against a different version of core?