Comment #2 on issue 2976 by smi...@gmail.com: Tuple can hold bool but subs fails
http://code.google.com/p/sympy/issues/detail?id=2976
no. The check that something has the _eval_subs is always done since this method is not needed if it doesn't do anything more than check for subs in the arguments. So whether it is a Basic object or not shouldn't matter.
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