When using the MaterializedNClobType data is saved to the database with unicode characters corrupted. (e.g. \u2018 is written to the database as ¿ )

e.g.
@Column(name = "TXT")
@Type(type = "org.hibernate.type.MaterializedNClobType")
@Lob
private String text;

I have traced it down to a couple of bugs:
1. When using STREAM_BINDING the code in NClobTypeDescriptor calls st.setCharacterStream instead of st.setNCharacterStream
2. When using NCLOB_BINDING the code in StringTypeDescriptor.unwrap will always shortcut at the Clob condition (therefore returing a Clob) and will never reach the code that creates an NClob