A present-but-empty U card — a bare U, or one followed by an empty token — is specified as the literal string "anonymous", and quarry left the author empty. The two are different claims: one says an anonymous person did this, the other says nobody did.

Absence of the card entirely stays a separate matter, governed by the per-type required-card rule of §5.2.

Noticed while tracing the §4.2 empty-token defect (zit#86), which is the same shape: a MUST a reader can skip without anything complaining. check-in: adf5f7c322 user: dmestas tags: trunk