Simplify the Type gob encode/decode

object.go

@@ -114,28 +114,12 @@ func (a ActivityVocabularyType) MarshalJSON() ([]byte, error) {
 
 // GobEncode
 func (a ActivityVocabularyType) GobEncode() ([]byte, error) {
-	if len(a) == 0 {
-		return []byte{}, nil
-	}
-	b := bytes.Buffer{}
-	gg := gob.NewEncoder(&b)
-	if err := gobEncodeStringLikeType(gg, []byte(a)); err != nil {
-		return nil, err
-	}
-	return b.Bytes(), nil
+	return []byte(a), nil
 }
 
 // GobDecode
 func (a *ActivityVocabularyType) GobDecode(data []byte) error {
-	if len(data) == 0 {
-		// NOTE(marius): this behaviour diverges from vanilla gob package
-		return nil
-	}
-	var bb []byte
-	if err := gob.NewDecoder(bytes.NewReader(data)).Decode(&bb); err != nil {
-		return err
-	}
-	*a = ActivityVocabularyType(bb)
+	*a = ActivityVocabularyType(data)
 	return nil
 }