{"64Fixed18Hard", math.Ldexp(6994187472632449, 690), 'e', 18, 64},

	// Trigger slow path (see issue #15672).
	// The shortest is: 8.034137530808823e+43
	{"Slowpath64", 8.03413753080882349e+43, 'e', -1, 64},
	// This denormal is pathological because the lower/upper
	// halfways to neighboring floats are:
	// 622666234635.321003e-320 ~= 622666234635.321e-320