final ExternalTypeHandler ext = _externalTypeIdHandler.start();
final PropertyBasedCreator creator = _propertyBasedCreator;
PropertyValueBuffer buffer = creator.startBuilding(jp, ctxt, _objectIdReader);
TokenBuffer tokens = new TokenBuffer(jp.getCodec());
tokens.writeStartObject();
JsonToken t = jp.getCurrentToken();
for (; t == JsonToken.FIELD_NAME; t = jp.nextToken()) {
String propName = jp.getCurrentName();
jp.nextToken(); // to point to value