Two things: 1) I recently implemented truncating long lines for CLI tool and went with a hybrid approach using both graphemes and virtual columns -- I'd only t

Two things: 1) I recently implemented truncating long lines for CLI tool and went with a hybrid approach using both graphemes and virtual columns -- I'd only truncate a line between graphemes, but when counting how much space was used up I would use virtual columns. In the case of something like , this means things tend to error on the "safe" side of truncating a line too early if the virtual column approach counts it as 4 columns wide rather than 2. 2) I wanted to test something with the scientist emoji and managed to crash Ruby's repl, irb, simply by pasting it into the repl and then backspacing over it. (It was clearly confused about the position of the cursor, and the stacktrace pointed to an error in a line_editor.rb file.) I was on Ruby 2.7.1, but it looks like it's been fixed in 3.0.0!