addClass("defaultdict", liburl("defaultdict-objects"), defaultdict);
String argh = "namedtuple-factory-function-for-tuples-with-named-fields";
NClassType namedtuple = newClass("(namedtuple)", table, BaseTuple);
namedtuple.getTable().update("_fields", liburl(argh),
new NListType(BaseStr), ATTRIBUTE);
addFunction("namedtuple", liburl(argh), namedtuple);
}