I chronically suffer from this problem. For example I started working on my chess software in 2008 and just yesterday someone raised an issue on GitHub asking m

I chronically suffer from this problem. For example I started working on my chess software in 2008 and just yesterday someone raised an issue on GitHub asking me about pertft(). Gulp. Fortunately it turned out my chess logic does pass that very specific, very easy to check correct/not correct test. But it would have been much better to have checked I was building on solid ground 13 years ago!