map[float64]string{7: "bar", -3: "foo", math.NaN(): "nan", math.Inf(0): "inf"},
		"NaN:nan -3:foo 7:bar +Inf:inf",
	},
	{
		map[complex128]string{7 + 2i: "bar2", 7 + 1i: "bar", -3: "foo", complex(math.NaN(), 0i): "nan", complex(math.Inf(0), 0i): "inf"},
		"(NaN+0i):nan (-3+0i):foo (7+1i):bar (7+2i):bar2 (+Inf+0i):inf",
	},
	{
		map[bool]string{true: "true", false: "false"},
		"false:false true:true",
	},
	{
		chanMap(),