def []=(i, value)
      if i > 128
        raise ISO8583Exception.new("Bits > 128 are not permitted.")
      elsif i < 2
        raise ISO8583Exception.new("Bits < 2 are not permitted (continutation bit is set automatically)")
      end
      @bmp[i-1] = (value == true)
    end
def []=(i, value)
      if i > 128
        raise ISO8583Exception.new("Bits > 128 are not permitted.")
      elsif i < 2
        raise ISO8583Exception.new("Bits < 2 are not permitted (continutation bit is set automatically)")
      end
      @bmp[i-1] = (value == true)
    end
Set the bit to the indicated value. Only `true` sets the
 bit, any other value unsets it.