I recently came across the following behavior in big-bang that was new to 
I am writing in case I have misunderstood something.

1. (stop-with model) does not run the draw handler one last time 
(this is documented but I'm not sure why this choice was made)
This means that a conditional in the draw handler cannot be used to draw a 
"win screen".

2. (stop-when predicate? final-draw-handler) 
the final-draw-handler runs at the stop of the animation, even if 
predicate? does not cause the animation to stop

The final-draw-handler is a fine creation. 
If we had access to it without the predicate? then students could use 
stop-when and get their win screen drawn without any extra baggage.
For example:
(to-draw ...)
(to-draw-final ...)

In addition, perhaps there could be an option / default of making the final 
draw handler be the same as the ordinary draw handler.

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