May be I am missing something
In [59]: (l<=0).subs({l:8})
Out[59]: False #fine
In [60]: (l<=0).subs({l:-8})
Out[60]: True #fine
In [58]: (l<=0).subs({l:oo})
Out[58]: True #not expected
In [64]: (l<=0).xreplace({l:oo})
Out[64]: True #not expected
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