Form.php

    /**
     * Bind values to the bound object
     *
     * @param array $values
     * @return mixed
     */
    public function bindValues(array $values = array())
    {
        if (!is_object($this->object)) {
            if ($this->baseFieldset === null || $this->baseFieldset->allowValueBinding() == false) {
                // return;
            }
        }
        if (!$this->hasValidated() && !empty($values)) {
            $this->setData($values);
            if (!$this->isValid()) {
                return;
            }
        } elseif (!$this->isValid) {
            return;
        }

        $filter = $this->getInputFilter();

        switch ($this->bindAs) {
            case FormInterface::VALUES_RAW:
                $data = $filter->getRawValues();
                break;
            case FormInterface::VALUES_NORMALIZED:
            default:
                $data = $filter->getValues();
                break;
        }

        $data = $this->prepareBindData($data, $this->data);

        // If there is a base fieldset, only hydrate beginning from the base fieldset
        if ($this->baseFieldset !== null) {
            $data = $data[$this->baseFieldset->getName()];
            $this->object = $this->baseFieldset->bindValues($data);
        } else {
            $this->object = parent::bindValues($data);
        }
    }