deserialize method
Implementation
@override
Int64MultiArray deserialize(ByteDataReader reader) {
//deserializes a message object of type Int64MultiArray
final data = Int64MultiArray();
// Deserialize message field [layout]
data.layout = MultiArrayLayout.$prototype.deserialize(reader);
// Deserialize message field [data]
data.data = reader.readArray<int>(() => reader.readInt64(), arrayLen: null);
return data;
}