code: func ParseByteUnit(str string) (uint64, error) {
  	str = strings.TrimSpace(str)
  	str = strings.ToLower(str)
  
  	if u, ok := bytesTable[str]; ok {
  		return u, nil
  	}
  	return 0, errors.Errorf("unknown unit: %q", str)
  }
docs: // ParseByteUnit returns the number of bytes in a given unit of storage, or an
  // error, if that unit is unrecognized.