New type system (#232)

* New type system

* Fixed dot notation for HTML elements

pkg/stdlib/datetime/helpers_test.go

@@ -31,24 +31,28 @@ func (tc *testCase) Do(t *testing.T, fn core.Function) {
 			So(err, ShouldBeNil)
 		}
 
-		So(actual.Type(), ShouldEqual, expected.Type())
+		So(actual.Type().Equals(expected.Type()), ShouldBeTrue)
 		So(actual.Compare(expected), ShouldEqual, 0)
 	})
 }
 
 func mustDefaultLayoutDt(timeString string) values.DateTime {
 	dt, err := defaultLayoutDt(timeString)
+
 	if err != nil {
 		panic(err)
 	}
+
 	return dt
 }
 
 func mustLayoutDt(layout, value string) values.DateTime {
 	dt, err := layoutDt(layout, value)
+
 	if err != nil {
 		panic(err)
 	}
+
 	return dt
 }
 
@@ -58,8 +62,10 @@ func defaultLayoutDt(timeString string) (values.DateTime, error) {
 
 func layoutDt(layout, value string) (values.DateTime, error) {
 	t, err := time.Parse(layout, value)
+
 	if err != nil {
 		return values.DateTime{}, err
 	}
+
 	return values.NewDateTime(t), nil
 }