Change lambdify's default for backend to llvm when available #431
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Background: I actually thought 'llvm' was our default, so I was surprised when I realized it actually isn't:
sympy/sympy#24673 (comment)
People coming to symengine.py is probably doing so for the performance advantage over SymPy, so I think changing the default is helpful here.
This could perhaps be considered mildly backwards incompatible, but I think the pros outweigh the cons. What do you think?