A modification of the one-sided sign test, which was proposed by Putter (1955), is shown to be an asymptotic UMP test. In contrast to the usual practice, zeros are not omitted but taken into account.
"An Asymptotic UMP Sign Test in the Presence of Ties." Ann. Statist. 1 (1) 166 - 169, January, 1973. https://doi.org/10.1214/aos/1193342394