helma 1.6

hi,
i justed started up my apps with the current helma head (i.e. the future 
helma 1.6). everything seems to work fine (so far) except that i can't 
access the methods of helma.scripting.rhino.extensions.RowSet anymore. 
Bug or Feature? :-)
greets,
  michi

----------------
   var dbc = getDBConnection("xyz");
   var query = "select 1";
   var rows = dbc.executeRetrieval(query);
   rows.next(); --> org.mozilla.javascript.EcmaError: TypeError: Cannot 
find function next.