commit https://github.com/vim/vim/commit/22fcfad29276bd5f317faf516637dcd491b96a12 Author: Bram Moolenaar <Bram@vim.org> Date: Fri Jul 1 18:17:26 2016 +0200 patch 7.4.1976 Problem: Number variables are not 64 bits while they could be. Solution: Add the num64 feature. (Ken Takata)

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