I'm getting an overflow exception when trying to serialize a Dictionary<ulong,byte[]> with about 2M entries of byte[100] :

Unhandled Exception: System.AggregateException: One or more errors occurred. ---> System.OverflowException: Arithmetic operation resulted in an overflow.
at MessagePack.Formatters.ByteArrayFormatter.Serialize(Byte[]& bytes, Int32 offset, Byte[] value, IFormatterResolver formatterResolver)
at MessagePack.Formatters.DictionaryFormatterBase`5.Serialize(Byte[]& bytes, Int32 offset, TDictionary value, IFormatterResolver formatterResolver)

Is there any hard limits on total size for the serialization?