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Add rails:update to the upgrading guides #15810
This means you can end up with "intended for new apps only" config options enabled, instead of their backwards-compatible defaults. For a recent example, see
Ideally, we would address this somehow, so it worked towards a slightly different target. But until then, it probably deserves some sort of warning.
Yes, I just fixed this on 4.1.2. The idea is to generate a configuration