Logged In: YES 
user_id=89016

OK, this has been fixed: function==None and function==lambda x:x
now behave the same (for str and unicode, for tuples it's
still broken, because PyTuple_GetItem() is used. (Checked in
as Python/bltinmodule.c 2.278 and  Lib/test/test_builtin.py
1.12)

Why can't we simply replace PyTuple_GetItem() with
tp_as_sequence->sq_item in filtertuple()?