Earlier quoted context omitted.
I thought about that. I thought the compiler could error with "Insufficient data for meaningful answer" until you'd added enough digits that the sequence was unambiguous. Then I tried it in OEIS and as you say there are too many sequences that start [1,2,3,4,5,...] - I think we may be stuck with generators and yield. But they're not exactly delightful.
Convert https://trout.me.uk/data.jpg to sixels and have the compiler emit that?
Thanks! My build scripts just got that little bit more entertaining (for me. not for the other devs).