Mpmath can take a very long time to evaluate the functions at some parameter ranges. For instance, `mpmath.psi(1e6, 10)`. For the hypergeometric series based functions, there's some control on runtime in terms of maxterms/maxprec/infprec/zeroprec keywords (it wasn't obvious what are good values for these, though). So in the end it was simpler just to restrict the runtime.