Seriously. Especially when something seems like a bizarre choice in the code, I'll provide a link if there is a corresponding GitHub issue or code regarding it.

I've never had an issue with GitHub issues regarding linkrot, but it happens quite frequently when linking actual source code, especially code not in your control. Not sure what a better solution is for that, unfortunately.

I generally justify it by the anecdotal observation that the code is generally not being used anymore by the time the link dies out, but that is far from an ideal justification.