TYPEMAP
projPJ	O_OBJECT

OUTPUT
O_OBJECT
    sv_setref_pv( $arg, "Geo::Proj4", (void*)$var );

INPUT
O_OBJECT
    if( sv_isobject($arg) && (SvTYPE(SvRV($arg)) == SVt_PVMG) )
	$var = ($type)SvIV((SV*)SvRV( $arg ));
    else {
	/* original version had a line break here that broke the code. */
	warn( \"${Package}::$func_name() - $var is not a blessed reference\" );
	XSRETURN_UNDEF;
    }