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The "-j" option was added 5 years ago (d9c39c3)
This "might" open security issues and does not bring great benefits anymore.
If you know which "-rails"-ending gem you want to install, you can manually
My opinion is that we don't need a full deprecation warning cycle for this change, since it only affects generating new apps, not existing apps. Let me know if that's not the case.
I looked for