The nickname document incorporates the Bidi Rule as its directionality rule
when enforcing nickname strings.
However, the Bidi Rule disallows names such as "1example" or "13371337", which
begin with a digit, and it is plausible for nicknames like those to occur.
(The first condition of the Bidi Rule allows names to begin only with L, R, or
AL characters, and an ASCII digit is an EN.) This issue is mentioned nowhere in
the framework or nickname documents and ought to be addressed somehow.
--Peter
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