fixes #165 - crash exporting an array with undefined as the first element

value.go

@@ -690,7 +690,9 @@ func (self Value) export() interface{} {
 				}
 				value := object.get(name).export()
 				t = reflect.TypeOf(value)
-				if state == 0 {
+				if t == nil {
+					state = 2
+				} else if state == 0 {
 					kind = t.Kind()
 					state = 1
 				} else if state == 1 && kind != t.Kind() {

value_test.go

@@ -237,6 +237,12 @@ func TestExport(t *testing.T) {
 			is(value[5], nil)
 			is(value[5], interface{}(nil))
 		}
+		{
+			value := test(`[ undefined, null ];`).export().([]interface{})
+			is(value[0], nil)
+			is(value[1], nil)
+			is(value[1], interface{}(nil))
+		}
 
 		roundtrip := []interface{}{
 			true,