code: func fastHash(input []byte) string {
  	h := fnv.New32a()
  	h.Write([]byte(input))
  	return fmt.Sprintf("%x", h.Sum32())
  }
docs: // fastHash hashes input using a hashing algorithm that
  // is fast, and returns the hash as a hex-encoded string.
  // Do not use this for cryptographic purposes.