Publishing errors fixed
I recently rewrote some key pieces of code that implement the publishing process, so if you've seen errors like "draft deleted while rendering markdown", "comment changed while rendering markdown" or (more recently and cryptically), "set" or "maxretry", these should now be a thing of the past. The root cause was some buggy corner cases in Firebase transactions so I ended up redesigning the schema to make transactions unnecessary.
You may still get a "Markdown rendering throttled to avoid triggering burst quota limits on GitHub" error, but it should be even more rare now, and you can just hit Publish again to keep making progress — your comments should go out after 2 or 3 tries at most.
As always, please don't hesitate to file and issue if you run into any errors or weirdness!