patch 9.0.0836: wrong error when using extend() with funcref Commit: https://github.com/vim/vim/commit/91c75d18d9cdc32df57e648640de7476fbcb4d76 Author: zeertzjq <zeertzjq@outlook.com> Date: Sat Nov 5 20:21:58 2022 +0000 patch 9.0.0836: wrong error when using extend() with funcref Problem: Wrong error when using extend() with funcref. Solution: Better check the variable type. (closes https://github.com/vim/vim/issues/11468, closes https://github.com/vim/vim/issues/11455)

" 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=