Exactly. I was handed a Rails project. Updated from Ruby 2.7 to 2.9 and it broke the app due to a class inheritance change. Very not expected behavior. :( . I had to roll the language version back to get the app to work again. I'm sure we will get to update the app dependencies eventually; I just did not expect a minor version update to wreck things to badly.
1st world problems right? :S
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