Fork of lines.love without drawings; useful starting point for further forks

reenable the assert of commit 8fc95f8804

Now it triggers for our down arrow bug.

Created by  Kartik K. Agaram  on August 16, 2022
A76AOSKCKOQL5ZGYGWCGNRCMKLUTKGCDVJ5G3ELTIVHZ7OFH35MQC
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