It's pretty easy, but if I'm looking at your Github to look at your work I can't find anything if you've clobbered your true history with a message.

I don't ever see that as a negative signal, but I do see it as a positive signal if I can just read your code, so if you write good code in public and you hide it, I can't find it.

Of course, whether you care is up to you, but if I find solid code there I'm going to recommend skipping technical evaluation if you're considering working with me.