Fair point that C wouldn't *guarantee* those exact results if anything about this example changed (e.g. change the order of data entry).
I was focusing on the framing method and how especially the default framing method changes the results with equal values so I was trying to keep everything very simple. I figured the teachable moment was more important than absolute purity. My apologies to those that I tripped up, and congratulations on your deep understanding of window functions and framing. 😎
There are no facts, only interpretations.