Why doesn't `DuckDBConnection.duplicate` return a `DuckDBConnection`?

[blacelle]

I consider DuckDBConnection.duplicate():

    public Connection duplicate() throws SQLException {
        checkOpen();
        connRefLock.lock();
        try {
            checkOpen();
            return new DuckDBConnection(DuckDBNative.duckdb_jdbc_connect(connRef), url, readOnly, sessionInitSQL,
                                        autoCommit);
        } finally {
            connRefLock.unlock();
        }
    }

Why does it returns a Connection instead of a DuckDBConnection?

Thanks