Hi!
I am using your library with success for some time. I do have a feature request, or more a brainstorm on how to solve this issue.

With your library I am basically unflattening the recurring event to flat single-day events. However the information that this was a recurring event is actually lost then. What is also lost is the information which recurring sequence this event was (the first, seconds, third occurrence).

Why do I need this? a) I have "normal" and recurring events. Sometimes I want to filter out the recurring events, as they bloat my usecase. b) I need a unique ID for each event. Usually the events have this id, but recurring events all have the same id. So I need to calculate a new internal id from the id + the sequence numer. That's at leats the plan.

Now how to solve this? Currently when parsing I will look at the whole input ical file and check if that original event had an rrule set. This way I can determine if the event was recurring. I currently cannot determine the sequence number, I'd need an rrule tool for that, I guess.

But isnt't there a way to built this into the library? Maybe with a custom X-RECURRING property or so? I don't want to bloat the library with my special usecase, but I can imagine, that others also might run into this issue. What are your thoughts?