docs: function parse_ShtProps(blob, length, opts) {
  	var def = {area:false};
  	if(opts.biff != 5) { blob.l += length; return def; }
  	var d = blob.read_shift(1); blob.l += 3;
  	if((d & 0x10)) def.area = true;
  	return def;
  }