/**
  * {@inheritdoc}
  */
 protected function configureProviderOptions(OptionsResolver $optionsResolver)
 {
     /* Parent options still apply. */
     parent::configureProviderOptions($optionsResolver);
     /* Define default values. */
     $optionsResolver->setDefault(ProviderServiceInterface::PROVIDER_OPT_GC_PROBABILITY, 1);
     $optionsResolver->setDefault(ProviderServiceInterface::PROVIDER_OPT_GC_DIVISOR, 100);
     /* Add allowed types. */
     $optionsResolver->setAllowedTypes(ProviderServiceInterface::PROVIDER_OPT_GC_PROBABILITY, 'int');
     $optionsResolver->setAllowedTypes(ProviderServiceInterface::PROVIDER_OPT_GC_DIVISOR, 'int');
     /* Set allowed values. */
     $optionsResolver->setAllowedValues(ProviderServiceInterface::PROVIDER_OPT_GC_PROBABILITY, function ($value) {
         return 0 <= $value;
     });
     $optionsResolver->setAllowedValues(ProviderServiceInterface::PROVIDER_OPT_GC_DIVISOR, function ($value) {
         return 1 <= $value;
     });
 }