> For an example that does not work in the old lambdify
> lambdify(y, Sum(x**y, (x, 1, oo)))(-2)

It works in the new lambdify, because

1. the namespace for eval() is build step by step out of the current
expression (the old lambdify just dumped a lot of different object in
the namespace and hoped that it works)

2. stuff is wrapped in float() or complex() or ().evalf as necessary

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