commit https://github.com/vim/vim/commit/91984b9034d3b698459622be277d963e0c6df60e Author: Bram Moolenaar <Bram@vim.org> Date: Tue Aug 16 21:58:41 2016 +0200 patch 7.4.2221 Problem: printf() does not support binary format. Solution: Add %b and %B. (Ozaki Kiichi)

" 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