After exposing the symbolic zeta function at the top level in #8864, we get:
We should return unsigned infinity in this case.
See also #5739.
Component: symbolics
Keywords: pynac
Author: Burcin Erocal
Reviewer: Karl-Dieter Crisman
Merged: sage-4.6.alpha3
Issue created by migration from https://trac.sagemath.org/ticket/9878