commit https://github.com/vim/vim/commit/1436d8d51cce114be56209924fc71376407e5bad Author: Bram Moolenaar <Bram@vim.org> Date: Mon Jul 11 22:41:15 2016 +0200 patch 7.4.2026 Problem: Reference counting for callbacks isn't right. Solution: Add free_callback(). (Ken Takata) Fix reference count.

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}\")