*   <dt>From the IPv6 reserved documentation prefix ({@code 2001:db8::/32}), {@code "2001:db8::1"}.
 *   <dd>{@code 20 01 0d b8 00 00 00 00 00 00 00 00 00 00 00 01}
 *   <dt>An IPv6 "IPv4 compatible" (or "compat") address, {@code "::192.168.0.1"}.
 *   <dd>{@code 00 00 00 00 00 00 00 00 00 00 00 00 c0 a8 00 01}
 *   <dt>An IPv6 "IPv4 mapped" address, {@code "::ffff:192.168.0.1"}.
 *   <dd>{@code 00 00 00 00 00 00 00 00 00 00 ff ff c0 a8 00 01}

    )
  }

  @Test
  fun hostIpv6AddressTooMuchCompression() {
    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

			ip: mustIP("::ffff:192.0.2.1"),
			s:  "0000:0000:0000:0000:0000:ffff:c000:0201",
		},
		{
			ip: mustIP("2001:db8::1"),
			s:  "2001:0db8:0000:0000:0000:0000:0000:0001",
		},
		{
			ip: mustIP("2001:db8::1%eth0"),
			s:  "2001:0db8:0000:0000:0000:0000:0000:0001%eth0",
		},
	}

	for _, tt := range tests {
		t.Run(tt.ip.String(), func(t *testing.T) {
			want := tt.s

	{CaseName: Name(""), in: `1e-7`, ptr: new(float64), out: 1e-7, golden: true},
	{CaseName: Name(""), in: `100000000000000000000`, ptr: new(float64), out: 100000000000000000000.0, golden: true},
	{CaseName: Name(""), in: `1e+21`, ptr: new(float64), out: 1e21, golden: true},
	{CaseName: Name(""), in: `-0.000001`, ptr: new(float64), out: -0.000001, golden: true},

	}
	return ret
}

// StringExpanded is like [Addr.String] but IPv6 addresses are expanded with leading
// zeroes and no "::" compression. For example, "2001:db8::1" becomes
// "2001:0db8:0000:0000:0000:0000:0000:0001".
func (ip Addr) StringExpanded() string {
	switch ip.z {
	case z0, z4:
		return ip.String()
	}

	const size = len("ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff")
	ret := make([]byte, 0, size)

function pruneEmptyRuleRows(row){if(row.subRows===undefined||row.subRows.length===0)return;if(row.subRows[0].rule===undefined){return;}