Perhaps, but it makes searching tricky
Finding a phone number in a database used to be annoying as you had to make sure that you normalized the full width ascii to regular ascii before storing and searching. Oracle didn't find a full width represented phone number when it was stored as regular ascii. Made web form programming kind of fiddly.
I think this is better now, but it points up some inconsistencies in the unicode standard. Clearly, "characters, no glyphs" is bogus.
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