u := &Int{false, nat{0, 0, 1 + 1<<(_W-1), _M ^ (1 << (_W - 1))}}
	v := &Int{false, nat{5, 2 + 1<<(_W-1), 1 << (_W - 1)}}

	r := new(Int)
	q, r := new(Int).QuoRem(u, v, r)
	const expectedQ64 = "18446744073709551613"
	const expectedR64 = "3138550867693340382088035895064302439801311770021610913807"
	const expectedQ32 = "4294967293"
	const expectedR32 = "39614081266355540837921718287"

	// integers
	{"%d", uint(12345), "12345"},
	{"%d", int(-12345), "-12345"},
	{"%d", ^uint8(0), "255"},
	{"%d", ^uint16(0), "65535"},
	{"%d", ^uint32(0), "4294967295"},
	{"%d", ^uint64(0), "18446744073709551615"},
	{"%d", int8(-1 << 7), "-128"},
	{"%d", int16(-1 << 15), "-32768"},
	{"%d", int32(-1 << 31), "-2147483648"},
	{"%d", int64(-1 << 63), "-9223372036854775808"},
	{"%.d", 0, ""},
	{"%.0d", 0, ""},

		ptr:      new(map[int64]string),
		out:      map[int64]string{math.MinInt64: "min", math.MaxInt64: "max"},
	},
	{
		CaseName: Name(""),
		in:       `{"18446744073709551615":"max"}`,
		ptr:      new(map[uint64]string),
		out:      map[uint64]string{math.MaxUint64: "max"},
	},
	{
		CaseName: Name(""),
		in:       `{"0":false,"10":true}`,
		ptr:      new(map[uintptr]bool),

		{"12345.0", 12345, Exact},
		{"12345.000000000000000000001", 12345, Below},
		{"18446744073709551615", 18446744073709551615, Exact},
		{"18446744073709551615.000000000000000000001", math.MaxUint64, Below},
		{"18446744073709551616", math.MaxUint64, Below},
		{"1e10000", math.MaxUint64, Below},
		{"+Inf", math.MaxUint64, Below},
	} {
		x := makeFloat(test.x)
		out, acc := x.Uint64()
		if out != test.out || acc != test.acc {