I've been working on a python implementation of the PRECIS specification
(https:github.com/byllyfish/precis-i18n).
The Username profiles apply the "bidi rule".
Directionality Rule: Applications MUST apply the "Bidi Rule"
defined in [RFC5893] to strings that contain right-to-left
characters (i.e., each of the six conditions of the Bidi Rule
must be satisfied).
Can someone please clarify whether:
A. The "Bidi rule" is ONLY applied to strings that contain right-to-left
characters.
B. The "Bidi rule" is applied to ALL strings.
If the answer is A, then "Juliet+" is a valid username.
If the answer is B, "Juliet+" is not a valid username because it violates
the Bidi rule.
I think the answer is probably A. However, this implies that right-to-left
usernames can never begin or end with ASCII punctuation.
Thanks,
Bill
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