Sanity Library Reference Docs
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    Assignee: { id: string; type: "user" } | { role: string; type: "role" }

    One member of an assignment entry's value, matched by the inbox reverse-query and rendered $assigned gate. A role member names a capability (fulfilled by whoever deploys that role), not a concrete principal — which is what distinguishes it from Actor. id here is a SYSTEM identifier (a principal), not authored identity.