I understand the change made to filter certain Unicode characters due to a large influx of spam. But, is it possible for the validation to allow exceptions for usernames containing Asian characters when
@-replying to a comment?
On ELL, I tried to reply to a comment from someone with a username comprised of three Unicode characters, 오준수, but it was denied with a "Comments cannot contain that content" error. I selected the name using the tab autocompleter, which these two answers seem to suggest should work.
I found this other question, but the answer was to use only the Latin characters in the name. The user I was trying to ping has no Latin characters in his username though.
Another question that seems to be very similar has a workaround for characters in the body of questions or answers, but I don't think this would work for pinging users in comments though.