any sensible Error, provided the Point Q be not so remote from the Axis,
nor the Lens so broad as to make any of the Rays fall too obliquely on
the refracting Surfaces.[A]

And by the like Operations may the reflecting or refracting Surfaces be
found when the two Foci are given, and thereby a Lens be formed, which
shall make the Rays flow towards or from what Place you please.[B]

	test_int8{fn: xor_127_int8, fnname: "xor_127_int8", in: 127, want: 0},
	test_int8{fn: xor_int8_127, fnname: "xor_int8_127", in: 127, want: 0}}

// TestArithmeticConst tests results for arithmetic operations against constants.
func TestArithmeticConst(t *testing.T) {
	for _, test := range tests_uint64 {
		if got := test.fn(test.in); got != test.want {