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Signer's User ID
I'd like to have a clarification of the signature subpacket
22.214.171.124. Signer's User ID
This subpacket allows a keyholder to state which User ID is
responsible for the signing. Many keyholders use a single key for
different purposes, such as business communications as well as
personal communications. This subpacket allows such a keyholder to
state which of their roles is making a signature.
This subpacket is not appropriate to use to refer to a User
It is not clear to me whether the string should be a verbatim copy of
the content of a User ID packet or some other information. The second
paragraph could be viewed as a hint for a verbatim copy.
OTOH, for applications it makes more sense to have just the vanilla
mail address (mailbox@domain) here. This would make it easier to
compare a mail's From address to the actual signature.
I don't care much about this but given that such a subpacket has been
defined but is not widely used - if at all - we might want to define
it in a stricter way.