commit https://github.com/vim/vim/commit/bd4593ffb170230504500ddedabad3fad1f31291 Author: Bram Moolenaar <Bram@vim.org> Date: Sat Jan 23 22:51:07 2016 +0100 patch 7.4.1160 Problem: No error for jsondecode('"'). Solution: Give an error message for missing double quote.

start:
test for empty string: ok
test for 1 char: ok
test for 3 chars: ok
test for contains meta char: ok
test for contains non-ascii char: ok