Ah, so the UI is scaling essentially? I can see how you would run out of decimal places.

I figured it would not actually be an infinite zoom but only a trigger to open the associated definition, and store the parent def as a bread crum variable to find our way back. Maybe when in the cluster, there could be some sort of visual clues when you are about to pop back out; the components and canvas fade/desaturate or something. Almost as though your zooming away, up through a layer of clouds... Alright, back to sleep for me!