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

make App.open_for_* look more like io.open

Now missing files will result in similar behavior: nil file handles.

Created by  Kartik K. Agaram  on August 23, 2022
NR43TWCNAUSV6MCAIGEGUTVCW32D37HCLQYPSVCJ6AVB7FOF255AC
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