Hibernate ClobJdbcType bindings: what are the diferences?

Question

Hibernate ClobJdbcType provides several binder types, but it's not documented and not so obvious for all developers. What are the "benefits" of:

• Stream vs simple String binder? (guess streams could have better performance on LOB types? )
• Extracting (STREAM_BINDING_EXTRACTING vs STREAM_BINDING)?

Bonus question: ClobJdbcType#STREAM_BINDING_EXTRACTING uses CallableStatement#setCharacterStream(String, Reader, long), but PgPreparedStatement#setCharacterStream(String, Reader, long) has been never implemented for long stream length. Why?