// Return a copy of a sequence where the __len__() method is
// telling the thruth.
protected static PyObject fastSequence(PyObject seq, String msg) {
if (seq instanceof PyList || seq instanceof PyTuple) return seq;
if (!seq.isSequenceType()) throw Py.TypeError(msg);
PyList list = new PyList();
PyObject iter = Py.iter(seq, msg);
for (PyObject item = null; (item = iter.__iternext__()) != null; ) {
list.append(item);
}
return list;
}
