code: func (v qrCodeVersion) versionInfo() *bitset.Bitset {
  	if v.version < 7 {
  		return nil
  	}
  
  	result := bitset.New()
  	result.AppendUint32(versionBitSequence[v.version], 18)
  
  	return result
  }
docs: // versionInfo returns the 18-bit Version Information value for a QR Code.
  //
  // Version Information is applicable only to QR Codes versions 7-40 inclusive.
  // nil is returned if Version Information is not required.