commit https://github.com/vim/vim/commit/18dfb4404a618c52ee7138630a2381aed4d66eaf Author: Bram Moolenaar <Bram@vim.org> Date: Tue May 31 22:31:23 2016 +0200 patch 7.4.1862 Problem: string() with repeated argument does not give a result usable by eval(). Solution: Refactor echo_striong and tv2string(), moving the common part to echo_string_core(). (Ken Takata)

" 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