To do Unicode right, you have to know what you mean by "character," which usually means never saying "character" and instead being more precise ("code point," "

To do Unicode right, you have to know what you mean by "character," which usually means never saying "character" and instead being more precise ("code point," "grapheme cluster," "byte representation"). You also have to figure out what people expect to happen when they hit backspace (does the whole grapheme cluster disappear? the most-recently-typed code point in the cluster disappear? do you have to hit backspace twice to get rid of surrogate pairs (a la Notepad on Windows)? should you have to hit backspace a variable number of times to delete code points encoded in UTF-8 (following the Notepad behavior to its logical conclusion)?).