docs: function write_BrtStyle(style, o) {
  	if(!o) o = new_buf(12+4*10);
  	o.write_shift(4, style.xfId);
  	o.write_shift(2, 1);
  	o.write_shift(1, +style.builtinId);
  	o.write_shift(1, 0); /* iLevel */
  	write_XLNullableWideString(style.name || "", o);
  	return o.length > o.l ? o.slice(0, o.l) : o;
  }