# File lib/spreadsheet/excel/writer/worksheet.rb, line 140
  def write_boolerr row, idx
    value = row[idx]
    type = 0
    numval = 0
    if value.is_a? Error
      type = 1
      numval = value.code
    elsif value
      numval = 1
    end
    data = [
      numval, # Boolean or error value (type depends on the following byte)
      type    # 0 = Boolean value; 1 = Error code
    ]
    write_cell :boolerr, row, idx, *data
  end