def flags
      fs = FRAME_FLAGS[type]
      [0x01, 0x02, 0x04, 0x08, 0x10, 0x20, 0x40, 0x80]
        .select { |v| @flags_value & v > 0 }
        .map { |val| fs && fs.key(val) || ("unknown_%02x" % val).to_sym }
    end
def flags
      fs = FRAME_FLAGS[type]
      [0x01, 0x02, 0x04, 0x08, 0x10, 0x20, 0x40, 0x80]
        .select { |v| @flags_value & v > 0 }
        .map { |val| fs && fs.key(val) || ("unknown_%02x" % val).to_sym }
    end
Returns the set flags on the frame.
 @return [Array<Symbol>] The flags.