Or is the slash fundamentally different from national characters?
I guess you could make the case that U+2215 is different from national characters, because it is a mathematical operator. Similarly, U+2044 is a general punctuation character. Are either of these already banned by nameprep?
There is another character U+30CE that looks like a slash. Perhaps we would warn about characters like this in nameprep2?
I still wonder whether U+2215 and U+2044 are sufficiently problematic to require a new ACE prefix.
Erik
