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I think it is inappropriate to create new API for this.
Instead, one of the many functions that already deal with
address parsing need to be enhanced. For example,
email.Util.formataddr should learn to format unicode
strings, too. Likewise, parseaddr could grow a parameter
do_unicode, or a second function parseaddr_unicode could be
added. There is IMO no need for a new class.

In addition, this patch lacks documentation and test cases.