[issue33524] non-ascii characters in headers causes TypeError on email.policy.Policy.fold

[Licht Takeuchi]

Change by Licht Takeuchi <licht-t at outlook.jp>:


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keywords: +patch
pull_requests: +6625
stage:  -> patch review

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue33524>
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