Thanks for sharing the link. I'm pulling out the valuable summary at the end. I'm not sure what you're alluding to with his language, but it's a clear and articulate post that junior devs, or folks used to working solo, should see to understand the thought process behind it.

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In other words, you really shouldn't rebase stuff that has been exposed anywhere outside of your own private tree. But within your own private tree, and within the commits that have never seen the light of day, rebasing is fine.

(And yes, there are exceptions. If it's a clear "throw-away tree" all the rules go out the window, of course, as long as everybody involved knows it's a throw-away tree, and know that if they pull it they have to synchronise 100% with you - so within a very tight-knit case or within a very specific small detail that is actively being worked on, those rebases with cleanups make tons of sense).

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