{"-9223372036854775808ns", -1 << 63 * Nanosecond},
	// largest negative round trip value, see https://golang.org/issue/48629
	{"-2562047h47m16.854775808s", -1 << 63 * Nanosecond},
	// huge string; issue 15011.
	{"0.100000000000000000000h", 6 * Minute},
	// This value tests the first overflow check in leadingFraction.
	{"0.830103483285477580700h", 49*Minute + 48*Second + 372539827*Nanosecond},
}

func TestParseDuration(t *testing.T) {

		{"-12345.000000000000000000001", -12345, Above},
		{"-12345.0", -12345, Exact},
		{"-1.000000000000000000001", -1, Above},
		{"-1.5", -1, Above},
		{"-1", -1, Exact},
		{"-1e-1000", 0, Above},
		{"0", 0, Exact},
		{"1e-1000", 0, Below},
		{"1", 1, Exact},
		{"1.000000000000000000001", 1, Below},
		{"1.5", 1, Below},
		{"12345.0", 12345, Exact},
		{"12345.000000000000000000001", 12345, Below},

	{CaseName: Name(""), in: `0.000001`, ptr: new(float64), out: 0.000001, golden: true},
	{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},

	// that fails and replaced ever char through numbers to anonymize the sample.
	longName := "/0000_0000000/00000-000000000/0000_0000000/00000-0000000000000/0000_0000000/00000-0000000-00000000/0000_0000000/00000000/0000_0000000/000/0000_0000000/00000000v00/0000_0000000/000000/0000_0000000/0000000/0000_0000000/00000y-00/0000/0000/00000000/0x000000/"
	hdr.Name = longName

	hdr.Size = 0
	var buf bytes.Buffer

 *   <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}
 * </dl>
 *
 * <p>A few notes about IPv6 "IPv4 mapped" addresses and their observed use in Java.
 *

 *   <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}
 * </dl>
 *
 * <p>A few notes about IPv6 "IPv4 mapped" addresses and their observed use in Java.
 *

		s  string
	}{
		{
			ip: Addr{},
			s:  "invalid IP",
		},
		{
			ip: mustIP("192.0.2.1"),
			s:  "192.0.2.1",
		},
		{
			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"),