Boxes are just the font not having that glyph – that doesn't destroy data. Question marks, U+FFFD or random gibberish are arguably at least as disastrous as ref

Boxes are just the font not having that glyph – that doesn't destroy data. Question marks, U+FFFD or random gibberish are arguably at least as disastrous as refusing to open a file (maybe more because you don't actually notice something is wrong).