Normalizes an object into a set of arrays/scalars
object $object object to normalize:
string $format format the normalization result will be encoded as:
array $context Context options for the normalizer:
array|scalar
Overrides NormalizerInterface::normalize
public function normalize($data, $format = null, array $context = array()) {
  if (null === $data || is_scalar($data)) {
    return $data;
  }
  if (is_object($data) && $this
    ->supportsNormalization($data, $format)) {
    return $this
      ->normalizeObject($data, $format, $context);
  }
  if ($data instanceof \Traversable) {
    $normalized = array();
    foreach ($data as $key => $val) {
      $normalized[$key] = $this
        ->normalize($val, $format, $context);
    }
    return $normalized;
  }
  if (is_object($data)) {
    return $this
      ->normalizeObject($data, $format, $context);
  }
  if (is_array($data)) {
    foreach ($data as $key => $val) {
      $data[$key] = $this
        ->normalize($val, $format, $context);
    }
    return $data;
  }
  throw new UnexpectedValueException(sprintf('An unexpected value could not be normalized: %s', var_export($data, true)));
}