3 ms·

Have you checked the UTF-8 encodings of all the typical "Unicode fonts" e.g. circled letters, superscripts and so on?

• yorwba 2y ago
  Good idea. I checked all alphanumeric characters whose UTF-8 encoding ends with \xa1. >>> '\N{fullwidth latin capital letter a}'.encode('utf-8') b'\xef\xbc\xa1' Ａ seems like the culprit.
  • immibis 2y ago
    Mystery solved!