commit https://github.com/vim/vim/commit/86edef664efccbfe685906c854b9cdd04e56f2d5 Author: Bram Moolenaar <Bram@vim.org> Date: Sun Mar 13 18:07:30 2016 +0100 patch 7.4.1557 Problem: Windows cannot be identified. Solution: Add a unique window number to each window and functions to use it.

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}\")