docs: function parse_BrtFmlaBool(data, length, opts) {
  	var end = data.l + length;
  	var cell = parse_XLSBCell(data);
  	cell.r = opts['!row'];
  	var value = data.read_shift(1);
  	var o = [cell, value, 'b'];
  	if(opts.cellFormula) {
  		data.l += 2;
  		var formula = parse_XLSBCellParsedFormula(data, end - data.l, opts);
  		o[3] = stringify_formula(formula, null/*range*/, cell, opts.supbooks, opts);/* TODO */
  	}
  	else data.l = end;
  	return o;
  }