code: func ComparePlatformUbiquity(chain1, chain2 []*x509.Certificate) int {
  	w1 := CrossPlatformUbiquity(chain1)
  	w2 := CrossPlatformUbiquity(chain2)
  	return w1 - w2
  }
docs: // ComparePlatformUbiquity compares the cross-platform ubiquity between chain1 and chain2.