A Universe Set

[jordan.nick at gmail.com]

Has the addition of a Universe Set object ever been suggested.  Like U
= set(0), so that any object was a member of U?  Maybe this gets into
some crazy Cantorian stuff since U is in U.  But it seems like it would
be useful and would have a nice symmetry with emptyset:set([]), that
is:

for any object a:
"a in set([])" returns False
"a in set(0)" returns True