patch 8.2.3899: Vim9: test for map() on string fails Commit: https://github.com/vim/vim/commit/ec86520f946a40d5c4a92d6a11d6928faa13abd4 Author: Bram Moolenaar <Bram@vim.org> Date: Sat Dec 25 22:10:42 2021 +0000 patch 8.2.3899: Vim9: test for map() on string fails Problem: Vim9: test for map() on string fails. Solution: Expect string return type.

" Vim filetype plugin
" Language:		JSON
" Maintainer:		David Barnett <daviebdawg+vim@gmail.com>
" Last Change:		2014 Jul 16

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

let b:undo_ftplugin = 'setlocal formatoptions< comments< commentstring<'

setlocal formatoptions-=t

" JSON has no comments.
setlocal comments=
setlocal commentstring=