JDBC driver method setClob always uses getAsciiStream()

Using driver: postgresql-8.4-701.jdbc3.jar

The method setClob() in the AbstractJdbc2Statement calls the method
getAsciiStream() on the provided Clob. This leads to problems if the
given Clob contains an UTF-8 encoded string.

Shouldn't the driver call getCharacterStream() instead? Can this problem
be solved in a different way?

Relevant code from the class:

public void setClob(int i, Clob x) throws SQLException
{
checkClosed();

if (x == null)
{
setNull(i, Types.CLOB);
return;
}

InputStream l_inStream = x.getAsciiStream();
...