I don't see the point of the header.ds field. We already have header.d, so why not just add header.s?

If there are two DKIM validations, the A-R header will look like this, no confusion I can see:

Authentication-Results: example.com; ...
  dkim=pass header.d=foo.com header.s=abc; header.b="A9hX4wGQ";
  dkim=none header.d=bar.com header.s=def; header.b="4icXsmdd"; ...

Bonus question: so what would this mean?

Authentication-Results: example.com; ...
  dkim=pass header.d=foo.com header.ds=bar.com,abc; header.b="A9hX4wGQ"; ...

Regards,
John Levine, [email protected], Primary Perpetrator of "The Internet for Dummies",
Please consider the environment before reading this e-mail. https://jl.ly

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