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The precision goal on the Cabibbo-Kobayashi-Maskawa matrix elements |Vus| and |Vud| requires the inclusion of isospin-breaking effects. These effects, associated to QED and the light-quark mass difference, can be included in lattice QCD+QED simulations. The long-range nature of QED, however, poses a problem for finite-volume lattice simulations that necessitates the adoption of a prescription for
