A blind rating as an answer to add with store.addLabel: confirmed,
since the person gave it themselves, recorded as theirs with their
reason. It's added beside other people's answers, never over them.
Throws when the reason is blank: a rating without one can't be checked
later.
Parameters
r: {raterId:string;reason:string;value:unknown}
Who rated, the answer (already read with the suite's
labelFromForm), and why.
A blind rating as an answer to add with
store.addLabel: confirmed, since the person gave it themselves, recorded as theirs with their reason. It's added beside other people's answers, never over them. Throws when the reason is blank: a rating without one can't be checked later.