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This is a consequence of the way list equality is
implemented. Counterexample:

>>> inf=1e9999
>>> x=inf/inf
>>> y=inf/inf
>>> x!=y and [x] == [y]
False

i.e. [x] == [y] iff x is y

strings are interned in python (so 'a' is chr(97) returns
True), and ints (so 1+1 is 1+1 returns True) but not floats
(so inf/inf is inf/inf returns False). 

Interning floats (or at least "special" numbers, such as nan
or inf) could make sense, but I guess this is a RFE, and not
a bug, and a different one.