Have a dwarf build a wall one Z level lower than he is
Is it possible to either have a dwarf build a wall one Z level lower than he is standing or else "fill in" a ramp one Z level lower? I find that when I have a pit with a ramp leading up inside I can fill every tile in the pit but the ramp, but then can't fill the ramp (to get that OCD required completely filled in pit).
I realize I could just build a floor over the ramp, but that would result in a horrible ramp-void under the floor.
Example:
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