I've added the following text as Section 4.1.4 (note fixed typos and removal of the i= section, which is removed from ARC explicitly):
4.1.4: Internationalized mail considerations In internationalized messages [RFC 6532] many header fields can contain UTF-8 as well as ASCII text. The changes for Email Address Internationalization (EAI) are all inherited from DKIM as updated by [draft-levine-eaiauth] and Authentication-Results as updated in [rfc7601bis], but are called out here for emphasis. In the AMS and AS header fields, the d= and s= tags can contain U-labels, and in all tags, non-ASCII characters need not be quoted in dkim-quoted-printable. The AAR header allows UTF-8 in the same places that A-R does, as described in [7601bis].
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