commit https://github.com/vim/vim/commit/5c29154b521e9948190be653cfda666ecbb63b5b Author: Bram Moolenaar <Bram@vim.org> Date: Sat Mar 19 20:05:45 2016 +0100 patch 7.4.1608 Problem: string() doesn't handle a partial. Solution: Make a string from a partial.

" For Yiddish capitals should not be checked.  But only change the
" 'spellcapcheck' option when it is not at its default value.
let s:spc = &l:spc
setlocal spc&
if s:spc == &l:spc
  setlocal spc=
else
  let &l:spc = s:spc
endif
unlet s:spc