It was a lucky decision.
As a final tweak, I moved from 8 bit ansi colors like \x1b[38:5:161m to 4 bit colors like \x1b[31m. This restricts our color range, but it saves something like 6 bytes per color.
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Quay to be dredged to stop barges getting stuck
I didn't spot this by myself. A reader first tipped me off to the similarities between the U24 …