Let me elaborate :-) I am still learning the new GitHub workflow, and it's common that I forget to close issues after merging a change. I had many issues that I forgot to update since we moved to GitHub.

I had also complex bugs splitted into small issues and it took time to fix all branches and to wait for buildots to confirm that it's really fixed.

To finish, I closed a lot of issues that were older than 2 years because the bug was fixed in the meanwhile in another issue, or just because I lost track of the issue and also lost interest and I don't consider that the bug or feature was worth it.

Victor