errNoComparison      = errors.New("missing argument for comparison")
)

type kind int

const (
	invalidKind kind = iota
	boolKind
	complexKind
	intKind
	floatKind
	stringKind
	uintKind
)

func basicKind(v reflect.Value) (kind, error) {
	switch v.Kind() {
	case reflect.Bool:
		return boolKind, nil
	case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:

			// of estimating the additional comparison cost.
			if elNode := l.listElementNode(*target); elNode != nil {
				k := elNode.Type().Kind()
				if k == types.StringKind || k == types.BytesKind {
					sz := l.sizeEstimate(elNode)
					elCost = elCost.Add(sz.MultiplyByCostFactor(common.StringTraversalCostFactor))
				}

	return errors.New("MustNotUnmarshalText was used")
}

func TestStringKind(t *testing.T) {
	type stringKind string
	want := map[stringKind]int{"foo": 42}
	data, err := Marshal(want)
	if err != nil {
		t.Fatalf("Marshal error: %v", err)
	}
	var got map[stringKind]int
	err = Unmarshal(data, &got)
	if err != nil {
		t.Fatalf("Unmarshal error: %v", err)
	}