patch 8.2.2272: Vim9: extend() can violate the type of a variable Commit: https://github.com/vim/vim/commit/aa210a3aeccc33c6051978017959126b037f94af Author: Bram Moolenaar <Bram@vim.org> Date: Sat Jan 2 15:41:03 2021 +0100 patch 8.2.2272: Vim9: extend() can violate the type of a variable Problem: Vim9: extend() can violate the type of a variable. Solution: Add the type to the dictionary or list and check items against it. (closes #7593)