for m[b] {
			m[b] = false
			b++
		}
		m[b] = true
	}
	var z Bits
	for b, set := range m {
		if set {
			z = append(z, b)
		}
	}
	slices.Sort([]int(z))
	return z
}

func TestNormBits(t *testing.T) {
	for _, test := range []struct {
		x, want Bits
	}{
		{nil, nil},
		{Bits{}, Bits{}},
		{Bits{0}, Bits{0}},
		{Bits{0, 0}, Bits{1}},
		{Bits{3, 1, 1}, Bits{2, 3}},