patch 8.2.1471: :const only locks the variable, not the value Commit: https://github.com/vim/vim/commit/241572794f7e93d2f8b762de2300e5f7e4f07628 Author: Bram Moolenaar <Bram@vim.org> Date: Sun Aug 16 22:50:01 2020 +0200 patch 8.2.1471: :const only locks the variable, not the value Problem: :const only locks the variable, not the value. Solution: Lock the value as ":lockvar 1 var" would do. (closes https://github.com/vim/vim/issues/6719)

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}\")