Am 06.09.19 um 17:05 schrieb René Scharfe: > A tag referencing an unknown object sounds strange to me. I imagine we > might get such a thing when the referenced object is lost (broken repo) > or purpose-built from an attacker. Could such a tag still be used for > anything? Are there other possible causes? Forward compatibility perhaps, i.e. supporting tags (by ignoring them) that point to a new type of object introduced by a future version.