patch 8.2.1969: Vim9: map() may change the list or dict item type Commit: https://github.com/vim/vim/commit/ea696852e7abcdebaf7f17a7f23dc90df1f5e2ed Author: Bram Moolenaar <Bram@vim.org> Date: Mon Nov 9 18:31:39 2020 +0100 patch 8.2.1969: Vim9: map() may change the list or dict item type Problem: Vim9: map() may change the list or dict item type. Solution: Add mapnew().

" Vim filetype plugin
" Language:	roff(7)
" Maintainer:	Chris Spiegel <cspiegel@gmail.com>
" Last Change:	2019 Apr 24

if exists("b:did_ftplugin")
  finish
endif
let b:did_ftplugin = 1

setlocal commentstring=.\\\"%s