flags2 byte
	flags3 byte
	flags4 byte
	ipv6   any
}

func newip4i_v4(a, b, c, d byte) ip4i {
	return ip4i{ip4: [4]byte{a, b, c, d}}
}

// BenchmarkIPv4_inline benchmarks the candidate representation, ip4i.
func BenchmarkIPv4_inline(b *testing.B) {
	b.ReportAllocs()
	ips := []ip4i{}
	for i := 0; i < b.N; i++ {
		ip := newip4i_v4(8, 8, 8, 8)
		ips = ips[:0]
		for i := 0; i < 100; i++ {