Our ProtoStream marshaller uses a 2 phase approach:
1. Determine the size of the requisite byte buffer
1a. Allocate a byte buffer using the calculated size
2. Marshal the object into the allocated byte buffer

Generally, this works well. However, ByteBufferMarshalledValue is a special case. Currently, to determine the buffer size for this object (step 1), the buffer itself needs to be created. A redundant buffer is then created during step 2.