Clicking on those links, I was surprised to discover io.js commits from as early as 2009.

Some of us not following too closely, may have been under the wrong impression about io.js being a new initiative.

io.js is a fork of node.js, so the commit histories are the same prior to io.js becoming a thing. it is a new initiative.

Ahh, that makes more sense, tnx for clarifying (:

I had no idea that's how GH designed the commit history UI.

Also, it might be a nice bonus, if there was an indication of the fork, somewhere on the graph timeline.