Make sure sympy is up to date. I get (with the development version):
>>> (l<=0)
l <= 0
>>> _.subs(l,oo)
False
>>> (l<=0).subs({l:oo})
False
If it is current, check your value of `l` -- maybe it is -1 or something.
There are some IOs that are missing and I'm not sure what may have happened
in them.
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