commit https://github.com/vim/vim/commit/ad5ca9bc1e7145474adb082775a805f1731e9e37 Author: Bram Moolenaar <Bram@vim.org> Date: Mon Jun 20 21:26:08 2016 +0200 patch 7.4.1948 Problem: Using Ctrl-A with double-byte encoding may result in garbled text. Solution: Skip to the start of a character. (Hirohito Higashi)

TYPEMAP
VIWIN	T_VIOBJNOMUNGE
VIBUF	T_VIOBJNOMUNGE

INPUT
T_VIOBJNOMUNGE
	if (sv_isa($arg, \"${ntype}\")) {
	    IV tmp = SvIV((SV*)SvRV($arg));
	    $var = INT2PTR($type, tmp);
	    if (!tmp)
		croak(\"$ntype no longer exists\");
	}
	else
	    croak(\"$var is not of type ${ntype}\")