review changes

@@ -376,9 +376,11 @@ private Object writeReplace() {
 builder.set(fieldName).to((BigDecimal) value);
 break;
 case STRING:
-case JSON:
 builder.set(fieldName).to((String) value);
 break;
+case JSON:
+builder.set(fieldName).to(Value.json((String) value));
+break;
 case BYTES:
 builder.set(fieldName).to((ByteArray) value);
 break;