MemoryPack.MemoryPackSerializationException: 'Requested invalid sizeHint.'

[xhuan8]

when try to writer a byte array with 20000 zeros, got this exception, what's the problem?

public override void Serialize<TBufferWriter>(ref MemoryPackWriter<TBufferWriter> writer
{
byte[] bytes = new byte[20000];

writer.WriteArray(bytes);