code: func (v qrCodeVersion) numBitsToPadToCodeword(numDataBits int) int {
  	if numDataBits == v.numDataBits() {
  		return 0
  	}
  
  	return (8 - numDataBits%8) % 8
  }
docs: // numBitsToPadToCodeword returns the number of bits required to pad data of
  // length numDataBits upto the nearest codeword size.