internal fun canonicalizeInetAddress(address: ByteArray): ByteArray =
  when {
    isMappedIpv4Address(address) -> address.sliceArray(12 until 16)
    else -> address
  }

/** Returns true for IPv6 addresses like `0000:0000:0000:0000:0000:ffff:XXXX:XXXX`. */
private fun isMappedIpv4Address(address: ByteArray): Boolean {
  if (address.size != 16) return false

  for (i in 0 until 10) {
    if (address[i] != 0.toByte()) return false
  }

      .isEqualTo(MAX_DATE)
    assertThat(parseCookie(9223372036854773807L, url, "a=b; Max-Age=3")!!.expiresAt)
      .isEqualTo(MAX_DATE)
    assertThat(parseCookie(50000L, url, "a=b; Max-Age=10000000000000000000")!!.expiresAt)
      .isEqualTo(MAX_DATE)
  }

  @Test fun maxAgeNonPositive() {
    assertThat(parseCookie(50000L, url, "a=b; Max-Age=-1")!!.expiresAt)
      .isEqualTo(Long.MIN_VALUE)

    assertInvalid(
      "http://[0000::0000:0000:0000:0000::0001]",
      "Invalid URL host: \"[0000::0000:0000:0000:0000::0001]\"",
    )
    assertInvalid(
      "http://[::0000:0000:0000:0000::0001]",
      "Invalid URL host: \"[::0000:0000:0000:0000::0001]\"",
    )
  }

  @Test
  fun hostIpv6ScopedAddress() {
    // java.net.InetAddress parses scoped addresses. These aren't valid in URLs.

    1000000000L,
    10000000000L,
    100000000000L,
    1000000000000L,
    10000000000000L,
    100000000000000L,
    1000000000000000L,
    10000000000000000L,
    100000000000000000L,
    1000000000000000000L
  };

  // halfPowersOf10[i] = largest long less than 10^(i + 0.5)
  @GwtIncompatible // TODO
  @VisibleForTesting
  static final long[] halfPowersOf10 = {
    3L,
    31L,
    316L,