patch 8.1.0048: vim_str2nr() does not handle numbers close to the maximum commit https://github.com/vim/vim/commit/07ccf7ce7fb948fd4d080b817e9fbaea9e721dab Author: Bram Moolenaar <Bram@vim.org> Date: Tue Jun 12 17:25:36 2018 +0200 patch 8.1.0048: vim_str2nr() does not handle numbers close to the maximum Problem: vim_str2nr() does not handle numbers close to the maximum. Solution: Check for overflow more precisely. (Ken Takata, closes https://github.com/vim/vim/issues/2746)

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refer to the Farsi help file by typing ":help farsi" in Vim.