[mikeash]

I understand how it works. Of course there's such thing as "an edited version" of a commit: it's a new commit that you create by taking an existing one and altering it. If you want to argue about terminology, please be my guest, but that's all your dispute is.

[phaemon]

If you know how it works then where did your last question come from? The bit you're "confused" about?

It's obvious what the answer is if you know how it works, so what was your point exactly?

[mikeash]

I know how git works in general. I wasn't 100% clear on the whole garbage collection aspect of it, which is hardly a central feature.

There's a difference between "has no idea how it works" and "understands the overall structure but doesn't know every single detail".