I am being a pendant here, but I think it is really important to poke students about "character" vs "code point". We have to be careful, even with basic ASCII to not confuse the two - it becomes a deadly mental model the minute you get to anything with a diacritical mark or accent. Its even worse when you work with any multi-codepoint glyphs (like emoji or Kanji). It's a ...whole thing.

Otherwise, great work here. Thanks so much for cleaning this mess up.

Still a tad triggered by those last "character" refs but agree they are better as-is for clarity. (Or at least I hope that brings clarity).