You did write "break the basic conceptions of", not "change". To me, a line overlapping with the previous two lines seems to do exactly that. Also, the origina

You did write "break the basic conceptions of", not "change". To me, a line overlapping with the previous two lines seems to do exactly that. Also, the original suggestion was for Unicode to add ornamental combining characters. I don't see how that would require any breaking change. You can already stack them vertically and horizontally.