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TFA says there is no difference since it falls through and does act as just a wrapper for anything that it doesn't implement itself.

But that’s my problem, I don’t want it to implement anything itself, I just want it to transform git output.

It's using libgit. IE it is basically still just a wrapper for official reference git implementation. I think you are worried anbout nothing.

correct

So he didn't 'rebuilt Git in Zig'.

The command "git" is a front-end for a lot of other seperate lower level functions, which he reimplimented in zig.

He did some stuff, he didn't do some other stuff. Nothing about this story is automatically invalid or pointless or misleading or unwholesome.