type PtrInterfaceItem struct {
	Str1 any // basic
	Str2 any // derived
}

// We'll send pointers; should receive values.
// Also check that we can register T but send *T.
func TestInterfacePointer(t *testing.T) {
	b := new(bytes.Buffer)
	str1 := "howdy"
	str2 := String("kiddo")
	item1 := &PtrInterfaceItem{
		&str1,
		&str2,
	}
	// Register the type.
	Register(str2)