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Also, I'm seeing that the mpmath.erf and erf commands do not give the same imaginary part on some inputs. So, it's off by more than 1.

sage: erf(i*1.42)

1.00000000000000 + 4.03986343036907*I

sage: import mpmath
sage: mpmath.erf(i*1.42)

mpc(real='0.0', imag='3.8217653554366318')