in ClientLibrary/ClientLibrary.cs [179:187]
public DefaultRecord(string sequenceNumber, string partitionKey, string data, long? subSequenceNumber = null,
double approximateArrivalTimestamp = 0d)
{
_data = Encoding.UTF8.GetBytes(data);
_sequenceNumber = sequenceNumber;
_partitionKey = partitionKey;
_subSequenceNumber = subSequenceNumber;
_approximateArrivalTimestamp = approximateArrivalTimestamp;
}