Feels like this proposal falls a little short, only considering static loops (ie the number of iterations is known beforehand) seems limiting, I always imagined implementing loops with “special” nodegroup where input sockets and output sockets would be identical except for an “Exit” output socket being 0 or 1 would either rerun the loop or exit the loop.
It’s simple elegant and answers all your questions you posed for a serial loop, a simple do-nothing loop would look like this
| Socket | Default Value |
|---|---|
| Iteraiton | 1 |
While calculating the Nth Fibonacci would be something like
| Socket | Default Value |
|---|---|
| Iteraiton | 1 |
| FibonacciN | 10 |
| F0 | 0 |
| F1 | 1 |