code: func CompareChainHashUbiquity(chain1, chain2 []*x509.Certificate) int {
  	hu1 := ChainHashUbiquity(chain1)
  	hu2 := ChainHashUbiquity(chain2)
  	return int(hu1) - int(hu2)
  }
docs: // CompareChainHashUbiquity returns a positive, zero, or negative value
  // if the hash ubiquity of the first chain is greater, equal, or less
  // than the second chain.