MarshalledValue contains non-serializable members

MarshalledValue implements Serializable. According to JavaDoc:
This class can be marshalled either via its externalizer or via the JVM serialization.

However, MarshalledValueByteStream raw is not serializable. ExpandableMarshalledValueByteStream is also not serializable.

This is causing issues when serializing objects with keys of type MarshalledValue in a cache store.