function _write(cfb/*:CFBContainer*/, options/*:CFBWriteOpts*/)/*:RawBytes|string*/ {
	var _opts = options || {};
	/* MAD is order-sensitive, skip rebuild and sort */
	if(_opts.fileType == 'mad') return write_mad(cfb, _opts);
	rebuild_cfb(cfb);
	switch(_opts.fileType) {
		case 'zip': return write_zip(cfb, _opts);
		//case 'mad': return write_mad(cfb, _opts);
	}