toJson method
Implementation
@override
Map<String, Object?> toJson() => {
'status': 'expired-history',
'cursor': cursor,
'reason': reason.wireName,
if (unavailableReason != null)
'unavailableReason': unavailableReason!.wireName,
'oldestCursor': oldestCursor,
'newestCursor': newestCursor,
'latestCursor': latestCursor,
};