Unicode password mapping for crypto standard

[Markus Scherer]

I would specify that UTF-8 must be used, without mapping.
US-ASCII is a proper subset, so need not be mentioned explicitly, nor
distinguished in the protocol.
Mappings would require that all implementations carry relevant data, and
are up to date to recent versions of Unicode, or else previously-unassigned
code points will cause failures.
As long as a user types the same password the same way, or with IMEs that
produce the same output, they are fine. Strange variants might improve
password security.

markus
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