patch 8.2.1356: Vim9: cannot get the percent register Commit: https://github.com/vim/vim/commit/7226e5b19bd6e081043cbcc32541ef72bbdf667d Author: Bram Moolenaar <Bram@vim.org> Date: Sun Aug 2 17:33:26 2020 +0200 patch 8.2.1356: Vim9: cannot get the percent register Problem: Vim9: cannot get the percent register. Solution: Check for readable registers instead of writable. (closes https://github.com/vim/vim/issues/6566)