if I have a Sequence from buildSequence, is there a way to collect all the elements it's already yielded and not care about anything else

Why not just... stop iterating through the sequence.

It's going to be an infinite sequence. in most cases i'm just going to care about the most recent elements its yielded but i do need a history which is why im not going with a channel

Yeah, break out of the iteration or use

take

.

If you require history, maybe you could make something that subscribes to the sequence and appends it to a list. Then you can get the entire list whenever you want

Yeah, you can use an iterator delegate.